RadioRanked verdict
Updated Nov 2026Comet SBB-224NMO Tri-Band Mobile vs HYS 21-inch NMO Kit with L-Bracket
Our pick
HYS 21-inch NMO Kit with L-Bracket$39.99
The Comet SBB-224 is the stronger performer here, but the choice depends on your needs.
The critical difference is tri-band coverage. The Comet handles 2-meter, 1.25-meter, and 70-centimeter bands with realistic gains of 3.2, 4.9, and 5.0 dBi respectively. The HYS covers only 2-meter and 70-centimeter, with much weaker 2-meter performance at 2.2 dBi due to its short quarter-wave design on that band. If you use 1.25 meters at all, the Comet is essential. Even without it, the Comet's superior 2-meter electrical length makes it the better all-rounder.
The HYS trades performance for price and simplicity. Its quarter-wave on 2-meter is electrically compromised, and Comet's claimed 6.2 dBi is optimistic marketing, but the realistic gains still favor it across the board. Both attract solid owner ratings (4.6 and 4.5 stars), so buyers report satisfaction with their choice.
Buy the Comet SBB-224 if you need true tri-band capability or demand better 2-meter performance. Buy the HYS only if you operate primarily on 70-centimeter, have budget constraints, and accept weaker 2-meter results. For most amateurs, the Comet's broader capability justifies its 2.5x price premium.
By use case
Which should you buy?
Budget-focused buyer running only VHF and UHF
Costs less and covers VHF and UHF, which is all this buyer needs.
HYS 21-inch NMO Kit with L-BracketOperator who needs 220 MHz coverage
Only the Comet covers 1.25m, and its realistic VHF and UHF gain is higher too.
SBB-224NMORepeater user working weak signals at range
Its longer electrical length gives a realistic gain edge on both VHF and UHF.
SBB-224NMOHiker or POTA operator carrying gear in a pack
The shorter rigid whip earns a higher portability score and is easier to stow.
HYS 21-inch NMO Kit with L-BracketVehicle owner with limited antenna clearance
At 533mm it sits well below the Comet's length, suiting tighter clearance spots.
HYS 21-inch NMO Kit with L-Bracket
Reasons to choose Comet SBB-224NMO Tri-Band Mobile
- Stronger on VHF (3.2 dBi vs 2.2 dBi at 146 MHz)
- Also covers 1.25m (223 MHz)
Reasons to choose HYS 21-inch NMO Kit with L-Bracket
- 60% cheaper ($39.99 vs $99.99)
- Lower profile by 15.0 in (533 mm vs 914 mm)
Spec battle
Spec-by-spec breakdown
Made your choice?
Comet SBB-224NMO Tri-Band Mobile
$99.99 on AmazonHYS 21-inch NMO Kit with L-BracketPICK
$39.99 on AmazonMore head-to-heads