Comet SMA-24J (SMA-Female) vs Retevis RHD-771 (SMA-Female)

The Retevis RHD-771 is the clear winner for handheld use. Its shorter length and lower price make it the practical choice for most users, and its overall score of 88 reflects this reality.

The single most important differentiator is VHF performance. The SMA-24J delivers a realistic negative 0.4 dBi on 146 MHz, while the RHD-771 is slightly worse at negative 1.0 dBi. Both are electrically short on VHF, but the difference is marginal in real-world handheld operation where ground plane is minimal anyway. On UHF, both achieve the same 2.9 dBi, making them equally capable at 435 MHz.

The SMA-24J's 3.5 dBi claimed gain is overstated; its actual performance on the bands shows it gains credibility only on UHF. The RHD-771 honestly claims 2.15 dBi and delivers on that promise across both bands.

For most handheld operators, buy the Retevis RHD-771. Its lower cost, compact size, and honest specifications make it the sensible everyday antenna. Buy the Comet SMA-24J only if you operate primarily on UHF and want the marginal extra length for slightly better aesthetics.

Choose the Retevis unless UHF is your primary focus.