Diamond SRH770S (SMA-Male) vs Nagoya NA-701 (SMA-Male)

The Nagoya NA-701 is the better choice for most users.

The critical difference is electrical length on VHF. The Diamond SRH770S achieves 0.34 wavelengths at 146 MHz, delivering realistic 1.3 dBi gain without requiring a ground plane. The Nagoya falls to just 0.10 wavelengths on VHF, producing a compromised negative 3.6 dBi. This is a substantial real-world disadvantage on the primary amateur radio band. On UHF, the Diamond over-extends to a full wavelength with minimal 0.2 dBi gain, while the Nagoya delivers a proper quarter-wave 0.8 dBi. Neither antenna excels across both bands, but the SRH770S won't handicap your most-used frequency.

However, the Nagoya costs half as much, measures one-third the length for genuinely portable use, and owners report slightly higher satisfaction across nearly eight times more reviews. The claimed 2.5 dBi spec is inflated and unsupported by its dimensions.

Buy the Diamond SRH770S if VHF performance on a handheld matters most and you accept a longer antenna. Buy the Nagoya NA-701 if portability and price are priorities and you accept compromised VHF performance. For balanced capability, the Diamond's realistic VHF advantage justifies its cost and length despite its UHF weakness.