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RadioRanked verdict

Updated Nov 2026

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

Our pick

HYS 21-inch NMO Kit with L-Bracket$39.99

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.

By use case

Which should you buy?

  • Owner with low-clearance parking

    The shorter 533mm whip clears low garage doors and drive-throughs far better than the 1016mm Comet.

    HYS 21-inch NMO Kit with L-Bracket
  • Fixed install prioritizing 2m reach

    Its longer VHF element realistically measures 3.5dBi, outperforming the shorter whip's 2.2dBi on 2m.

    CA-2X4SRNMO
  • First-time NMO installer

    The kit includes the mount and cable, so a first-time installer needs nothing else to get started.

    HYS 21-inch NMO Kit with L-Bracket
  • Tight-budget buyer

    The cheaper kit costs less than the Comet and delivers reasonable VHF results for a limited budget.

    HYS 21-inch NMO Kit with L-Bracket
  • Distant UHF repeater operator

    Its multi-wavelength UHF element realistically delivers 5.4dBi, giving it an edge for distant repeater work.

    CA-2X4SRNMO

Reasons to choose Comet CA-2X4SRNMO Dual-Band Mobile

  • Stronger on VHF (3.5 dBi vs 2.2 dBi at 146 MHz)

Reasons to choose HYS 21-inch NMO Kit with L-Bracket

  • 58% cheaper ($39.99 vs $94.99)
  • Lower profile by 19.0 in (533 mm vs 1016 mm)

Spec battle

Spec-by-spec breakdown

Comet CA-2X4SRNMO Dual-Band MobileSpecHYS 21-inch NMO Kit with L-Bracket
$94.99
Price
$39.99
1016 mm
Length
533 mm
0.49 λ, half wave
On VHF (146 MHz)
0.26 λ, quarter wave
1.47 λ, multi-wavelength
On UHF (435 MHz)
0.77 λ, full wave
—
Claimed gain
2.15 dBi
—
Is that claim credible?
Supported by its length
NMO
Connector
NMO
mobile
Type
mobile
No
Flexible
No
64
Overall Score
69
+8% for winner
Black
color
With Bracket and NMO Cable Mount
0
unitCount
1

Made your choice?

Comet CA-2X4SRNMO Dual-Band Mobile

$94.99 on Amazon

HYS 21-inch NMO Kit with L-BracketPICK

$39.99 on Amazon

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