How to Improve Simplex Range on Ham Radio: 6 Step Guide

To improve simplex range on a ham radio, raise your antenna height first since VHF and UHF range depends on the radio horizon not power. After that, add antenna gain, cut feedline loss and check the terrain between stations. Power matters least of all five steps.

How to Improve Simplex Range on Ham Radio: Step by Step

1. Raise the antenna first: Height beats every other fix on VHF and UHF simplex, because usable range is set by the radio horizon not wattage. A rooftop, attic run or a nearby hill does more for range than any antenna or radio upgrade below it.
2. Move up to a gain antenna: A 5/8 wave whip or small Yagi concentrates more signal toward the horizon instead of wasting it straight up. That is a real jump over a stock rubber duck or quarter wave whip.
3. Fix the feedline next. Cheap coax wastes real power before it reaches the antenna. A 100 foot run of RG-58 at 146 MHz delivers only about 28% of your transmit power to the antenna (Ham Radio School, 2026). Low loss LMR-400 delivers roughly 70% over the same run. Keep runs short and upgrade the cable before the radio.
4. Add power last and expect little from it: Doubling your transmit power only adds about 3 dB, a jump a listener may barely notice. Going from 5 W to 50 W still will not punch through blocking terrain. Power fixes weak signals it does not fix blocked ones.
5. Check the Fresnel zone not just visual line of sight: A path can look clear and still lose strength if a hill, tree line or roofline cuts into the Fresnel zone around it. A visible path is not automatically a clean one.
6. Recheck your link margin after every change: Height, gain, feedline and terrain all stack together. Re-run the numbers after each fix instead of guessing which one helped and stop once you have a comfortable buffer over the noise floor.

The Antenna Gain Mistake That Costs You Range

Bigger gain numbers do not always mean a stronger signal. Not close in. High gain collinear antennas flatten their radiation pattern into a wider, thinner disc that reaches farther on flat ground. 

That same flattened pattern can null out a station on a hill or a few floors above you. A 3 dBi antenna often outperforms a 9 dBi antenna for close-in, uneven terrain simplex contacts even though the spec sheet says the opposite.

Bottom Line

Height wins. Fix gain, feedline and terrain next, and treat power as the last resort when you want to improve simplex range on a ham radio.

Once you've raised the antenna, added gain and cut feedline loss, plug your real height, gain, and cable figures into our antenna gain and link budget calculator to see your exact link margin instead of guessing. It shows in seconds whether your changes actually closed the gap.

Other Common Amateur Radio Questions: LMR-400 vs RG-8X for Ham Radio: 2m and 70cm Loss Compared