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Reviews For: Diamond RH770

Category: Antennas: VHF/UHF+ Omnidirectional: verticals, mobile, etc

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Review Summary For : Diamond RH770
Reviews: 1MSRP: 33,53 € + VAT as of January 2023
Description:
The Diamond RH770 is a telescopic 144/430MHz (2m/70cm) portable antenna with a male BNC connector (as all Diamond RH antennas). Length: 93cm (retracted 22.3cm) 10 stages Weight: 85g Gain: 3.0dBi (144MHz), 5.5dBi (430MHz) Maximum power rating: 20W Impedance: 50 ohms VSWR: <1.5 Connector: BNC(m) Type: 1/2wave radialless(144MHz), 2x5/8wave radialless (430MHz)
Product is in production
More Info: https://www.diamond-ant.co.jp/english/amateur/antenna/ante_3hand/ante_hand1.html
# last 180 days Avg. Rating last 180 days Total reviews Avg. overall rating
1515
DB6BD Rating: 2023-01-17
Finally a performant handheld antenna Time Owned: 0 to 3 months.
This is a beautiful piece of handheld antenna engineering. It is the only 1/2 Lambda for 2 m and 2x5/8 Lambda for 70 cm portable antenna I know of. Compared to the typical 1/4 Lambda rubber duckies, this beauty works without counter poise. That means that you do not have to install radials or hold the portable setup in a certain distance to your body to achieve resonance. I did some field strength measurements to compare several 1/4 Lambda antennas to this one. On 2m it's farfield field strength is around 10 dB stronger, while on 70 cm it is around 6 dB stronger.

I admit that an almost 1 m long antenna is not very handy under all circumstances. BUT it is lightweight and retractable to very portable 22.3 cm. So if you need the extra punch from a handheld in a remote location, this is the portable antenna you need. Of course there are other antennas with more gain, but certainly not as portable as this one.