Ham Radio Range Calculator
Estimate your VHF/UHF simplex communication range based on transmit power, antenna setup, operating frequency, and terrain. Select a quick preset or enter your own values.
Radio Horizon (line of sight)
6.3 mi
Effective Radiated Power
8.2 W
Path Loss at Range
90.7 dB
Signal Margin
+68.5 dB
Terrain Factor
55% of theoretical
Frequency
146 MHz
Moderate Range: Reasonable range for everyday handheld use. You should be able to hit nearby repeaters and make simplex contacts within a few miles.
Important: This is a simplified estimate based on free-space path loss and radio horizon geometry. Real-world range depends on many factors including buildings, vegetation, weather, antenna quality, coax loss, and receiver sensitivity. Use this as a starting point, not a guarantee. Repeaters can extend your effective range well beyond simplex limits.
Want more range? Compare radios by TX power or see our picks for best long-range handhelds.
How Ham Radio Range Works
VHF and UHF signals travel in approximately straight lines, which means your range is primarily limited by line of sight between your antenna and the receiving station. The Earth's curvature creates a "radio horizon" beyond which signals cannot reach without bouncing off obstacles or atmospheric layers.
Three factors dominate your practical range: antenna height (determines radio horizon distance), transmit power combined with antenna gain (determines signal strength at the receiver), and terrain (determines how much of your theoretical range you actually achieve). Of these, antenna height is often the most impactful and least expensive to improve.
The Propagation Model
This calculator combines two models. First, the radio horizon formula using the 4/3 Earth radius refraction model: d (miles) = sqrt(2 x h) where h is antenna height in feet. The total line-of-sight distance is the sum of both stations' radio horizons.
Second, a link budget analysis using free-space path loss: FSPL (dB) = 20 x log10(d) + 20 x log10(f) + 32.44 where d is distance in km and f is frequency in MHz. The calculator compares your effective radiated power against a typical receiver sensitivity of -120 dBm.
Worked example: A 5W handheld at 5 ft with a stock antenna (2.15 dBi) talking to another handheld at 5 ft on 146 MHz in suburban terrain. The radio horizon for each station is about 3.2 miles, giving 6.3 miles total. After the suburban terrain correction factor (55%), the estimated range is roughly 3.5 miles.
Typical Ranges by Setup
Rough range estimates for common amateur radio configurations in mixed suburban terrain on the 2m band:
| Setup | Power | Antenna Height | Typical Range |
|---|---|---|---|
| Handheld (stock antenna) | 5W | 5 ft | 1-4 miles |
| Handheld (better antenna) | 5W | 5 ft | 2-6 miles |
| Vehicle-mounted | 25-50W | 5 ft | 5-15 miles |
| Base station (roof) | 25-50W | 30 ft | 10-25 miles |
| Base station (tower) | 50W | 60 ft | 15-40+ miles |
Tips for Increasing Your Range
1. Get your antenna higher. This is the single most effective way to increase VHF/UHF range. Moving from ground level to a rooftop can double or triple your coverage area. Even standing on a hill or holding your handheld above your head helps.
2. Upgrade your antenna. Replacing a stock rubber duck antenna with a higher-gain aftermarket whip or a small Yagi can add 3-6 dB, effectively doubling to quadrupling your signal. For handhelds, a 15-inch whip with 3-5 dBi gain is a popular upgrade.
3. Minimize coax loss. If you are using a feed line, shorter and thicker coax means less signal loss. Use our coax cable loss calculator to see how much power your cable is absorbing.
4. Use a repeater. Repeaters are high-powered stations on hilltops or towers that receive your signal and retransmit it. A handheld that gets 3 miles simplex can reach 30+ miles through a well-placed repeater. Most areas have multiple VHF/UHF repeaters.
Shopping for a radio with more power or better receiver sensitivity? See our top picks for long-range handhelds.
Frequently Asked Questions
How far can a 5-watt handheld ham radio reach?
A typical 5-watt handheld with a stock antenna can reach 1 to 5 miles simplex depending on terrain and obstructions. In open, flat terrain with clear line of sight you may get 4-5 miles. In urban areas with buildings blocking the signal, expect 1-2 miles. Using a repeater can extend your effective range to 20-50+ miles.
Does more power always mean more range?
Not proportionally. Doubling your power only adds about 3 dB to your signal, which is barely noticeable. Going from 5W to 50W (10x power) adds 10 dB, roughly doubling your range in ideal conditions. Antenna height and gain often matter more than raw power for VHF/UHF communications.
Why is antenna height so important for VHF/UHF range?
VHF and UHF signals travel in mostly straight lines (line of sight). The higher your antenna, the farther the radio horizon extends before the Earth curves away. Raising your antenna from 5 feet to 30 feet roughly doubles your radio horizon distance, which is why rooftop and tower-mounted antennas dramatically outperform handhelds at ground level.
How accurate is this range estimate?
This calculator provides a rough estimate based on simplified propagation models. Real-world range depends on many variables including building materials, vegetation density, weather conditions, antenna quality, coax cable losses, and receiver sensitivity. Use the results as a general guide for planning, not as a precise prediction. Actual performance testing in your area is the best way to know your true range.