Comet CA-2X4SRNMO Dual-Band Mobile vs HYS 21-inch NMO Kit with L-Bracket

The HYS 21-inch wins this matchup despite its lower price and more modest electrical lengths. While the Comet CA-2X4SR achieves better UHF performance at 1.47 wavelengths, the HYS delivers more balanced dual-band operation with a half-wave VHF design that needs no ground plane, making it genuinely versatile across both bands. The Comet's quarter-wave VHF mode at 0.26 wavelengths represents a significant compromise on the primary band.

The single most important differentiator is VHF performance. The Comet's electrical length falls short of a true half-wave, which it should easily achieve at this size. The HYS achieves the optimal half-wave configuration, giving it the decisive edge where most mobiles spend their time.

Buy the HYS 21-inch if you want reliable, practical performance without overpaying. Buy the Comet CA-2X4SR only if UHF dominates your operating and you can accept mediocre VHF results in exchange for its slightly higher UHF gain.

The HYS is the smarter choice. It costs half as much, performs better on VHF where it matters most, and avoids the Comet's electrical compromises. At this price point, there's no reason to accept inferior engineering.