RadioRanked verdict
Diamond Antenna
Diamond RH77CA (BNC)
The performance here is good but not better than cheaper whips of similar length; the premium buys you the Diamond name and a strong review record. Worth it if that matters to you, skippable if it does not.
Proprietary RR score
How we scored it
Performance is derived from the antenna's length in wavelengths on each band it covers, not from the advertised gain. How we score →
Length versus wavelength
What 381 mm Buys You
An antenna radiates according to its length measured in wavelengths, not according to the number on the packaging. Here is where this one lands on each band it covers.
| Band | Wavelength | This antenna | Works out as |
|---|---|---|---|
| VHF146 MHz | 2053 mm | 0.19 λ | electrically short |
| UHF435 MHz | 689 mm | 0.55 λ | half wave |
Decision helper
Is this antenna right for you?
Yes, if you're…
- ✓BNC-equipped Icom, Yaesu, and Vertex handhelds
- ✓Buyers who want a name-brand upgrade over a generic clone
Skip it, if you're…
- ✕Budget-focused buyers; the electrical performance is matched by cheaper whips
- ✕SMA-Female or SMA-Male radios (wrong connector)
Tradeoffs
The good and the bad
What we like
- Strong 70cm electrical length near half wave
- Highest average rating in this lineup
- Reputable brand, solid BNC build
- Gain claim is credible
What we don't
- Mediocre on 2m like any whip this length
- Costs noticeably more than SMA whips with the same electrical performance
Ready to buy?
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Overview
The Diamond RH77CA is a 381mm dual-band whip with a BNC connector, aimed at BNC-equipped handhelds like Icom and Yaesu models rather than the SMA jacks on Baofeng-style radios. Diamond is a known name in the antenna world, and this one carries the highest average rating in this lineup at 4.7 stars, though on a modest 120 reviews. It sells for around $25, a real step up from the SMA clones.
At 381mm, the electrical length works out to about 0.19 wavelengths on 2m, mediocre and in the same range as most 15-inch whips, and about 0.55 wavelengths on 70cm, right at the half-wave sweet spot that performs well without a ground plane. The 2.15 dBi claim is conservative next to what the model predicts for 70cm, so it holds up. The performance profile is essentially identical to the cheaper SMA whips in this size class; what you are paying extra for here is the Diamond name, BNC build quality, and the review record behind it.
Specifications
| Frequency bands | VHF, UHF |
| Gain | 2.15 dBi |
| Connector | BNC |
| Length | 381 mm |
| Antenna type | whip |
| Flexible | Yes |
| size | Small |
| color | Black |
| unitCount | 0 |
Key Features
- Designed for 144/430 MHz amateur radio bands; antenna performance depends on proper radio compatibility and correct installation. Not universal and not compatible with all radios.
- Designed for handheld radio users, this high gain antenna significantly improves transmit and receive efficiency compared to standard stock antennas, providing clearer audio and more dependable connections in urban and outdoor environments
- The RH77CA antenna features a flexible yet durable construction that resists bending and wear during daily use, ensuring consistent performance for field operations, emergency communication, and long listening sessions
- Compatible with a wide range of dual-band handheld transceivers, this antenna is optimized for portability without sacrificing performance, making it a trusted upgrade for ham radio enthusiasts and professionals alike
- Precision tuned for amateur radio frequencies, the Diamond RH77CA antenna reduces signal loss and interference, helping users maintain stable communication even in challenging terrain or signal-dense locations
- The Diamond RH77CA dual-band HT antenna is engineered to deliver enhanced signal performance on both 144 MHz and 430 MHz frequencies, making it ideal for amateur radio operators seeking reliable communication and extended operating range