Long-range two-way radios: how many km in reality?
Technical guide · range and coverage
A long-range two-way radio communicating directly with another, without infrastructure, usually covers a few hundred metres to a few kilometres: around 1 to 2 km in cities and 2 to 5 km in open areas, according to Hytera. Figures of 20, 50 or 100 km are possible, but as the result of a system: an elevated antenna, repeater, repeater network, mobile radio or mobile internet.
The answer to “does a 100 km two-way radio exist?” is therefore: not as a pair of handheld radios at ground level. The curvature of the Earth itself limits this case to around 10 km, even without obstacles. For 50 or 100 km, a business needs elevated infrastructure, linked repeaters, PoC over 4G/LTE wherever there is coverage or, in remote areas, satellite communication.
Updated on · ABC Mais Telecom technical team: Motorola Solutions and Hytera two-way radio sales, rental and technical support.
How many km a long-range two-way radio can cover
Range is not a radio specification. It is the result of the whole setup: radio, antenna, height at each end, terrain, buildings, frequency band and infrastructure. The same device may communicate over 500 metres inside a business complex and tens of kilometres from a hilltop to a valley.
The table below brings together typical ranges by scenario. These are reference intervals, based on manufacturers’ guidance and radio-horizon calculations. They are not a promise for a specific address: the result depends on site conditions and requires testing.
| Scenario | Typical range | Main factors | Basis |
|---|---|---|---|
| Handheld to handheld, building, warehouse or basement | A few hundred metres; may fail at less than 1 km | Concrete, metal, floors, stairways and basements | Hytera: even good radios may struggle beyond 1 km in dense urban areas |
| Handheld to handheld, urban area | Around 1 to 2 km | Buildings in the path and the speaker’s position | Hytera walkie-talkie range guide |
| Handheld to handheld, open area | Around 2 to 5 km; higher-end models up to around 15 km under optimal conditions | Terrain, vegetation and the Earth’s curvature | Hytera walkie-talkie range guide |
| Handheld on a hilltop communicating with a valley | Tens of km, only with clear line of sight | Height and unobstructed line of sight | Motorola: “up to 35 miles” (around 56 km) from mountain to valley under optimal conditions |
| Mobile or base radio with an elevated external antenna | From a few km to several tens of km | Antenna height, power and terrain | Radio horizon (calculation below) and Motorola mobile radio specifications (up to 45 to 50 W) |
| Handhelds through an elevated repeater | The area around the elevated site; tens of km in open areas, less in cities | Repeater antenna height and the handheld’s return link, transmitting at up to 4 or 5 W | Radio horizon and Motorola DEP500e specifications |
| IP-linked repeaters | Between cities and states, adding together each repeater’s coverage area | Coverage at each site and data-link quality | Motorola IP Site Connect (up to 15 sites); Hytera IP Multi-site (up to 32 repeaters) |
| PoC over 4G/LTE and Wi-Fi | Nationwide, wherever a data signal is available | Operator coverage, data plan and platform | Motorola: WAVE PTX with nationwide coverage in Brazil |
| Satellite PTT | Global, including areas without mobile coverage | Visible sky and a contracted satellite service | Icom IC-SAT100, Iridium network |
Why advertised “50 km” and “100 km” radios are misleading
Search for “professional 100km two-way radio” and you will find walkie-talkies advertised with 12, 50 or 100 km ranges, almost always without test conditions. Three facts separate marketing from reality.
1. The maximum figure is measured under ideal conditions
Motorola advertises the Talkabout T470 range in the United States as up to 35 miles, around 56 km. The note on its own page explains that the figure was calculated under optimal conditions, with unobstructed line of sight, and that actual range varies with terrain and is usually shorter. On the same page, the manufacturer states up to 2 miles (around 3 km) in residential neighbourhoods. It is the same radio, with a difference of more than 15 times between the scenarios.
2. The Earth’s curvature limits the signal
On VHF and UHF, the bands used by professional radios, the signal travels almost in a straight line. The classic radio-horizon formula, using an effective Earth radius of 4/3, is d ≈ 4,12 × (√h1 + √h2), with antenna heights in metres and distance in km. It gives the geometric maximum, without buildings, trees or hills in the path:
| Antenna A | Antenna B | Radio horizon (theoretical maximum) |
|---|---|---|
| Handheld in the hand, 1,5 m | Handheld in the hand, 1,5 m | Around 10 km |
| Handheld, 1,5 m | Tower or building, 30 m | Around 28 km |
| Handheld, 1,5 m | Repeater 100 m above ground | Around 46 km |
| Tower, 30 m | Tower, 30 m | Around 45 km |
| Point 150 m above ground | Point 150 m above ground | Around 100 km |
In other words, for two radios to communicate over 100 km, both ends need to be far above the terrain between them. At ground level with a handheld radio, geometry already imposes a limit near 10 km. In practice, range is much shorter because of obstacles, handheld output power and receiver sensitivity.
3. “1000 km” involves a different technology
The search “1000 km range two-way radio” mixes categories. Distances of thousands of km are possible on HF (shortwave, from 3 to 30 MHz), which reflects off the ionosphere. This is a different type of equipment, with quality varying by time of day and ionospheric conditions, rather than the walkie-talkie used by an operations team. Above around 30 MHz, the signal normally passes through the ionosphere and does not return.
What determines a long-range two-way radio’s coverage
The essentials when deciding whether to buy or rent:
- Antenna height. This makes the biggest difference, as the radio horizon shows. An antenna high on a tower is worth more than extra watts at ground level.
- Power. A professional handheld such as the Motorola DEP500e transmits at up to 5 W on VHF and 4 W on UHF; mobile radios such as the DGM 5000e reach 45 or 50 W in high-power versions, depending on the band. Hytera notes that excessive power also drains the battery and causes interference.
- Antenna. A handheld’s short helical antenna has low gain and is affected by the user’s body. An antenna on the wrong band or a damaged antenna reduces range.
- Terrain and obstacles. Hills, buildings, dense vegetation, metal structures and basements create dead zones.
- Band: UHF or VHF. VHF tends to perform better in open areas; UHF is usually assessed first in buildings. See the guide UHF or VHF: which band to choose.
- The handheld’s return link. A powerful base or repeater may be heard far away, but the handheld must be able to answer. Always test in both directions.
- Battery and radio condition. A weak battery and loose antenna reduce performance at the end of the shift.
Real solutions for long-range communication
If the distance exceeds what a pair of handhelds can deliver, the question changes from “which radio” to “which architecture”. These are the solutions used in the professional market, from the most local to the widest-reaching.
Repeater at an elevated site
A repeater receives a call on one frequency and retransmits it on another, using a high, well-positioned antenna. The elevated site makes the difference: a rooftop, tower or hill near the centre of the area to be covered. For temporary operations, radio repeater rental allows coverage to be validated without buying the infrastructure.
IP-linked repeaters
When one repeater cannot cover everything, several can be linked through a data network. Motorola states that MOTOTRBO IP Site Connect links up to 15 sites, including sites in different states or countries, with automatic roaming between areas. Hytera describes an IP Multi-site solution with up to 32 repeaters. Total coverage is the sum of each repeater’s area; the connection between them travels over the IP link. This is an option for highways, transmission lines, mines and companies with multiple facilities. Explore the radio communication systems.
Mobile radio and base station
A radio installed in a vehicle or fixed base, with an elevated external antenna and more power than a handheld. It serves fleets, extensive yards and control rooms communicating with dispersed teams.
PoC: push-to-talk over 4G/LTE
A PoC radio uses the operator’s data network and a communication platform. Wherever there is coverage, it connects teams in different cities. Motorola introduced WAVE PTX in Brazil with nationwide coverage and interoperability with DMR radio systems. The network is the limitation: tunnels, basements, rural dead zones and congestion affect calls. Find out more in the guide to PoC two-way radios.
Satellite, for remote areas only
Satellite PTT radios such as the Icom IC-SAT100 use the Iridium network, which covers the entire planet. They suit farms without mobile coverage, expeditions, forest areas and isolated operations. They require visible sky and a satellite service, and do not replace radios for daily operations in urban areas.
| Solution | Distance addressed | Depends on | When it makes sense |
|---|---|---|---|
| Direct handheld communication (without infrastructure) | Hundreds of metres to a few km | Environment and line of sight | Teams in the same area, events, condominiums, construction |
| Repeater at an elevated site | One region around the elevated site | Antenna location, licensing and design | Large areas, buildings with dead zones, farms, industrial plants |
| IP-linked repeaters | Multiple regions, cities or states | Multiple sites and a data link | Highways, mining, energy, multiple facilities |
| Mobile or base radio | From a few km to tens of km | Elevated external antenna and installation | Fleets, yards, operations centres |
| PoC 4G/LTE | Nationwide, wherever data is available | Operator, plan and platform | Teams in different cities or on different routes |
| Satellite PTT | Global | Visible sky and satellite service | Remote areas without mobile coverage |
In practice, many operations combine two layers: radio with a repeater at the workplace and PoC for people on the road. PoC does not replace radio where there is no mobile signal, and conventional radio continues working locally if the data network goes down.
Use cases by sector
Generic scenarios to guide the survey. These are not guaranteed results.
Agribusiness: headquarters, fields and machinery
Problem: the team buys “20 km” walkie-talkies and loses contact behind hills and in wooded areas. Solution: a repeater at the property’s highest point, mobile radios in machinery and at headquarters, and satellite only for those going beyond coverage. What to measure: points without communication on the farm map, in both directions, with machinery running.
Linear construction and energy: highway, pipeline or transmission line
Problem: work fronts move tens of km and a single repeater cannot cover the section. Solution: IP-linked repeaters along the route and PoC for travelling supervisors wherever there is coverage. What to measure: call continuity when moving between coverage areas and sections without data.
Logistics and transport: distribution centre and fleet on the road
Problem: the yard works well with radios, but drivers leave the coverage area within minutes. Solution: conventional radio at the distribution centre and PoC over 4G/LTE for the fleet, with a shared group when the platform supports integration. What to measure: control-room response time and failures by route section.
Events across extensive areas: races, rallies or festivals
Problem: the route stretches for kilometres and passes behind terrain; coordination cannot hear the most distant posts. Solution: radio rental with a temporary elevated repeater and, if the route is too long, PoC for mobile teams. What to measure: testing every post before opening, with failures recorded by location.
Common mistakes when looking for long-range radios
- Buying by the number on the box. “50 km” without test conditions is not useful for planning an operation.
- Assuming more watts solve everything. Antenna height and infrastructure position usually matter more than power.
- Testing in one direction only. Can the base hear the handheld? Can the handheld hear the base? Both answers must be yes.
- Forgetting critical points. Basements, stairways, cold rooms and valley bottoms undermine the average performance of any route.
- Changing antennas and frequencies without guidance. Replacing an antenna with one for another band or reprogramming a radio outside its authorisation harms range and may cause interference. Spectrum is a public resource managed by Anatel. See the guide does a two-way radio need an Anatel licence?.
- Treating PoC as long-range radio. PoC reaches places with data coverage, not radio coverage. Without a mobile signal, there is no call.
Checklist before buying or renting a long-range two-way radio
- Draw the map. Mark the control room, most distant points, most enclosed points and travel routes.
- Define who talks to whom. Everyone to everyone, or each team to the control room?
- Record the environment. City, building, open land, terrain, woodland, basement, metal structure.
- Find an elevated site. A rooftop, tower or hill with a view over most of the area.
- Check data coverage. If teams work on routes or in other cities, check the 4G signal on the actual sections.
- Choose the architecture. Direct radio, repeater, IP-linked repeaters, mobile radio, PoC, satellite or a combination.
- Test before committing. Make a short call at every point, in both directions, using the accessory the team will wear.
- Classify the result. Intelligible without repeating, intelligible with repetition, or no communication.
The step-by-step test is in the guide radio rental for 1 km or 5 km: how to test coverage. ABC Mais Telecom’s two-way radio rental includes use of Anatel-licensed frequencies, with daily, weekly, monthly or long-term periods in the State of São Paulo, and can include a repeater when testing shows it is necessary.
Frequently asked questions about long-range radios
Does a 100 km two-way radio exist?
Not as one handheld communicating directly with another at ground level: the Earth’s curvature limits this case to around 10 km, even without obstacles. Communication over 100 km is possible with a system: interconnected elevated repeaters, base radios with high antennas, PoC over 4G/LTE or satellite.
What is the actual range of a two-way radio?
According to Hytera, around 1 to 2 km in urban areas and 2 to 5 km in open areas for consumer handhelds, reaching around 15 km with higher-end models under optimal conditions. Inside buildings and basements, it may be less than 1 km.
Which two-way radio has the longest range?
No model guarantees range everywhere. The longest range comes from combining an elevated antenna, a mobile or base radio and a repeater. For distances between cities, the solution is a repeater network or PoC rather than a more powerful handheld.
How can two-way radio range be increased?
Raise the antenna, use a mobile or base radio with an external antenna, install a repeater at an elevated site and keep the antenna and battery in good condition. First, carry out a coverage test to identify where communication fails.
UHF or VHF: which reaches farther?
VHF tends to perform better in open areas, while UHF is usually assessed first in buildings and areas with obstacles. The authorised band, antenna height and on-site testing matter more than the general rule.
Does a two-way radio work without internet?
Yes. Conventional radio, analogue or digital DMR, works without internet, directly or through a repeater. Only PoC depends on a data network, while IP-linked repeaters depend on the link between sites.
Does a long-range walkie-talkie need a licence?
It depends on the equipment and band. General-use radios do not require a station licence. ABC rental includes use of Anatel-licensed frequencies. Other cases are explained in the Anatel licensing guide.
Sources consulted
- Hytera: How far can walkie-talkies reach (range intervals by environment).
- Hytera: factors affecting radio communication distance.
- Hytera: conventional DMR and IP Multi-site solutions.
- Motorola Solutions: Talkabout T470 (advertised range and note on optimal conditions).
- Motorola Solutions: MOTOTRBO IP Site Connect.
- Motorola Solutions: DGM 8000e and DGM 5000e mobile radio specifications.
- Motorola Solutions: DEP500e handheld specifications.
- Motorola Solutions: WAVE PTX launch for Brazilian businesses (2022).
- Icom: IC-SAT100, satellite PTT on the Iridium network.
- Line-of-sight propagation and radio horizon (effective Earth radius of 4/3).
- HF ionospheric propagation (skywave).
- Anatel: radio frequency and spectrum management.
- Anatel: product certification and approval, frequently asked questions.
Need to communicate over 5, 20 or 50 km? ABC Mais Telecom has over 10 years in the market, is an authorised Motorola Solutions reseller (Silver) and a Hytera channel, and has its own technical support facility in São Bernardo do Campo (SP). We help your company test coverage and choose between radio, repeater, IP-based systems and PoC. Business customers (CNPJ).
