Comet SBB-1NMO Compact Dual-Band Mobile vs Comet SBB-5NMO Dual-Band Mobile

The SBB-5NMO is the better all-around antenna. Both are legitimate dual-band performers, but the SBB-5NMO's longer physical length translates to superior electrical performance where it matters most: it operates at half-wave on VHF (3.4 dBi realistic gain) instead of being electrically short, and extends into multi-wavelength territory on UHF. The SBB-1NMO is compromised on VHF, delivering only 0.7 dBi despite its claimed 2.15 dBi figure. On UHF both perform similarly at around 5 dBi, so the VHF advantage belongs entirely to the longer antenna.

The single most important difference is VHF electrical length: the SBB-5NMO reaches 0.47 wavelengths while the SBB-1NMO stays at 0.20 wavelengths, a significant gap that real-world performance cannot overcome.

Buy the SBB-1NMO only if you need compact packaging and mainly operate UHF. Buy the SBB-5NMO if you use both bands seriously and have roof or trunk space for a 965 mm antenna.

The SBB-5NMO is the clear recommendation. At $17 more it delivers stronger VHF performance and owners report satisfaction at 4.8/5 across 94 reviews versus 4.4/5 on the compact model.