Diamond SRH770S (SMA-Male) vs Nagoya NA-771 (SMA-Male)

The Nagoya NA-771 is the clear winner for handheld radio use.

The single most important differentiator is electrical length. The Diamond SRH770S performs reasonably on VHF at 0.34 wavelengths (1.3 dBi), but its full-wavelength electrical length on UHF (0.2 dBi) means it radiates poorly on that band. The Nagoya is electrically short on VHF at minus 1.0 dBi, but its 0.57 wavelength length on UHF delivers the 2.9 dBi gain its makers claim, making it far superior where most handheld activity happens. On a handheld radio without a ground plane, half-wavelength efficiency matters more than raw length.

The Diamond suits users who split time between VHF and UHF with VHF as the priority, accepting the UHF tradeoff for balanced performance across bands. The Nagoya suits UHF-focused operators and those carrying one antenna that needs to work well where it counts most.

Buy the Nagoya NA-771. Owners report satisfaction across 701 reviews at 4.7 out of 5, it delivers better electrical performance where handheld operators actually transmit, and its flexibility is a practical advantage for portable use. The price gap, unknown for Nagoya, would need to be substantial to outweigh its performance advantage.