Nagoya NA-771G (GMRS) vs Retevis RHD-771 (SMA-Female)

The NA-771G is the clear winner for GMRS users. This antenna is purpose-built for the band at 465 MHz, where it achieves a genuine 5/8-wave electrical length that delivers realistic 3.1 dBi gain. The RHD-771 is a compromise design attempting to cover both VHF and UHF with a single antenna, resulting in poor performance on both. At VHF, it's electrically short at 0.19 wavelengths, producing negative gain that will noticeably degrade performance. On UHF it's acceptable but not optimal.

The single most important differentiator is electrical length optimization. The NA-771G dedicates its design to GMRS performance, while the RHD-771 spreads its compromise across two bands. A short antenna on VHF is fundamentally limited regardless of marketing claims; Retevis's stated 2.15 dBi gain overstates what this antenna actually delivers.

Buy the NA-771G if you primarily operate GMRS and want an antenna matched to the band. Buy the RHD-771 only if you need to split time between VHF and UHF on a budget and accept reduced performance on both bands.

Choose the NA-771G. The 11-dollar price difference is immaterial compared to the performance advantage for dedicated GMRS use.