Nagoya GPK-01 (21" Radials) NMO Mount Ground Plane Kit for Base or Field Use, SO-239 Connector, Mounts to 2" Pole, Mast, Pipe

I have bought many, 10+ antennas from Nagoya. Everything I have used has Performed flawlessly. I recommend these to anyone who's into communications. Well made with top quality materials.

This is an excellent replacement for the white antenna typically used on a house. My HOA said no the fiberglass stick but a mobile antenna has not been seen and works great.

Mounted this to a pipe on the roof of a building, installed an NMO mobile antenna, done. Checked SWR, all good. Plenty of ground plane for VHF or UHF.Only complaint it the metal is a little thin and slightly weak, especially at the 90 degree bend from vertical to horizontal. With a taller antenna and some wind, it'll bend and not stay vertical.

Got this ground plane kit to test on my mobile rig. Tested this two different Comet antenna. One is a Comet CSB790A and a Comet CA-2x4SR. Both are dual banders.Though these antenna are mounted on a 1"x2" extrusion style rack. Though I have a decent grounding from the rack to the steel roof on my 1999 Toyota 4-Runner. This ground plane kit helps with the SWR a tad bit. On the Comet CSB790A antenna. It's a UHF style and I got a NMO adapter for the antenna mount.So with that being said. I tested the SWR and wattage output from my ICom 2730A mobile radio with the MARS mod using a Surecom SW102 meter and a Sysjoint NanoVNA-F V3 analyzer. One to test the harmonics and resonance of both antenna on 2m and 70cm bands.Both were tested on the 2m and 70cm calling frequency. Was able to make several contacts about 40+ miles away with full quieting. This kit did improve a tab but nut I don't plan on using this while being mobile. This kit best work on attaching the supplied stainless steel bracket to a post or pole using two supplied heavy duty hose clamp where there's no flat metal object to use a ground plane.I haphazardly attached this to my wooden fence and it did to reduce and lower the SWR quite a bit.Everything helps when you're trying to make that connection either simplex or trying to hit that long distance repeater long distant away.Also Nagoya said you can use this while mobile but my highly not the SWR don't help much or at all. But word of caution is that if you wish to use this while driving. I would recommend use medium strength thread locker on the hardware before you start driving.Great ground plane kit with no issues other than the set screw is small. I almost 4 of them.I would recommend this to any mobile HAM operatiors especially when you're at park with just a wooden post or tree you can attach the bracket to.

Item as advertised.Easy to install with a mobile antenna giving it a good ground plane. Mounting bracket not too bad either.Does come with UHF radials and additional extensions to make it work better on VHF.Well constructed and looks fairly sturdy.

This is a Bulkhead PL-259 connector NOT a NMO mount and it's performance shows. Absolute junk, antenna on a magnet mount on a cookie sheet at 5ft high works but place the same antenna on this mount 25ft up in the air and NOTHING.

This review is about the ground plane kit:It's a ground plane kit -- it works. However, I found that only one of four set screws on the radials would work. The threads were cut too deep, so the screws would not engage with the thread while the radial was in place. Since I was preparing a semi-permanent installation, I just ended up soldering the radial parts together.

I bought 6. Only one from Amazon though ther ten dollars more at Amazon 😞😔😠☹️ come down in price and all buy more ... I set up ham raideos... For the elderly and and mentally challenged. Take cair... Tommy out..... Click. Click.