Comet SBB-5NMO Dual-Band Mobile vs HYS Pre-Tuned Dual-Band NMO Magnetic Mount

The Comet SBB-5NMO is the stronger performer. Its half-wave VHF design delivers better balance across both bands, where the HYS struggles on VHF with a quarter-wave electrical length that realistically reaches only 2.0 dBi. On UHF, both antennas perform similarly at around 5 dBi, but the Comet's superior VHF credentials make it the more versatile choice for dual-band work. The Comet's claimed 5.5 dBi gain is supported by its electrical length; the HYS's claimed 5 dBi slightly overstates what a quarter-wave VHF element delivers.

The single most important differentiator is VHF performance. The Comet's half-wave design on VHF outperforms the HYS quarter-wave by roughly 1.4 dBi, a meaningful gap in mobile antenna work.

Buy the Comet SBB-5NMO if you use VHF regularly and want balanced dual-band coverage. Buy the HYS if budget is the priority and you favor UHF operation, where both antennas converge.

Choose the Comet. The $26 price difference is justified by better electrical design where it matters most, and owners report 4.8 out of 5 across 94 reviews.