Reddit reviews 2PCS RF Coaxial Coax Adapter PL259 UHF Male to SO239 UHF Female Right Angle Adapter PL259 to SO239 90 Degree Jack Connector
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Material:Nickel-Plated Machined Brass ConstructionFor Antennas, Wireless LAN Devices , Coaxial cable, Wi-Fi Radios External Antenna and so onImpedance :50 ohmPackage include:2 x AdaptersShape: right angle
Sorry, but WTF is that right angle abomination?Those split washers aren't doing you any favors sticking into the gap of that slot. You need a mount with an actual SO239 stud on it, mounted through an appropriate sized hole. Don't use a separate ground wire. You're creating a ground loop. Ground coming from the coax needs to come in contact with the mount, which happens by default with a SO239 stud.[Edit] Just discovered the "FireRing". I guess the fire part is what comes out the back of your radio. I see lots of people online having SWR issues with these things. Several commenters stated that it uses cheap coax to boot.
RF isn't DC. Making an electrical connection isn't good enough. There's a fair amount of engineering that goes into designing a coaxial connector to keep it from effecting the signal, and I suspect this firering never had that advantage. If you need a right angle, you can get a pair of SO239 elbows on Amazon for $9 and stick it on the SO239 stud.