The Cobra GMRS High Gain Antenna (Item 0010137-1) is a 15-inch, 5/8-wave, +3dBi screw-on upgrade that extends line-of-sight GMRS range on Cobra TrailBlazer 250, 450, and 500 handheld radios. It's the best-fit upgrade for hikers, overlanders, and hunters fighting dead zones in challenging terrain. Buy online now for just $10.00 — 50% off the $19.95 compare-at price — with free shipping on orders over $45.
Specifications
- Brand: Cobra
- Part Number: 0010137-1
- Product Type: GMRS high-gain replacement antenna, 5/8 wave
- Gain: +3dBi
- Length: 15 inches
- Connector: SMA male, tool-free screw-on
- Compatibility: Cobra TrailBlazer 250, 450, 500 GMRS handhelds
Will the High Gain Antenna Improve Range on My TrailBlazer 450?
Yes — the +3dBi gain and 5/8-wave design concentrate signal at the horizon, improving line-of-sight propagation and reducing dead zones versus the stock 1/4-wave antenna. Results are strongest in open terrain; dense forest still limits all radios.
How to Install
Twist off the stock antenna and screw the SMA male connector on firmly by hand. You're operational in seconds with no tools.
Is It Legal to Replace the Antenna on a GMRS Radio?
Yes. GMRS regulations permit antenna changes on certified radios; this genuine Cobra antenna is a direct factory-designed replacement.
Price and Deal Value
At $10.00, this high-gain upgrade costs less than half its $19.95 list — an affordable range boost. Apply coupon OUTPOST12 for an extra 12% savings, and pair with a replacement antenna or radio to clear the $45 free-shipping threshold.
Comparisons and Alternatives
Compared to the factory-spec 1/4-wave replacement antenna, this 5/8-wave high gain model trades compact size for +3dBi of gain and longer reach. If you lost your stock antenna and want like-new performance, buy the 1/4-wave; if you want maximum range, buy this one.
