K400S K-400S Diamond Original K400S Heavy Duty Hatchback/Trunk Mobile Mount - K400 Base with UHF Mount - 13.5 Feet of RG316 - PL259

The best but too much money

Very useful and very easy to install it, the built quality is solid and heavy duty.

Its great stuff very will made strong and highly recommended.

perfect mount for the Diamond antenna.

I cannot recommend this antenna mount as it is made now because it will not hold the antenna in a fixed position. I recently purchased a Diamond K400S as the recommended mount for a Diamond CR-8900A antenna. I planned on using my YAESU FT-8900R in the lower 10 and 6 meter bands which I have never used before. This was a 3,500 mile trip and unfortunately I was never able to use the radio. The antenna mount would not stay tightened. I didn’t get even 20 minutes from home before the mount started to wobble loose. After several attempts at tightening one of the axis screws, I gave up and removed the antenna. I notice that regardless how tight the axis screw is, there is still play/wobble in one of the axis (see photo). I wonder if this causes the screw to come lose in a short period of time. Note, it is not the trunk clamp wobbling. It is the axis even when screw is fully tightened. Eventually (in my case - 20 minutes), the antenna falls over because the screw comes lose and lets the axis turn freely. The CR-8900A antenna, made by the same manufacturer, specifically calls for this mount to be used. I think the mount is not stable enough for the weight of the heavy antenna. Right now, I can only use the mount when the car is stationary and I install the antenna. The antenna has to be removed to drive any distance. Although this will work in some cases, it is disappointing and does not qualify as a properly working product. Update: Dealers who sell the mount generally do not permit returns, so I emailed Diamond for support. There has been no response.

Unfortunately, this does not fit on the rear door of a Wrangler JLU (2018+). The metal on the rear door is beefed-up around the edges making it too thick for the clamp to work. The hood is thin enough to attach it there. I still give it a decent rating because, although useless to me, it is of good quality materials.

Works great with my Diamond quad band antenna zero complaints nicest mount I have used

I bought this on the recommendation of another ham operator. He’s had his for 2 years and many miles of use. Easy to install and very solid.

This was recommended by Amazon to go with the diamond quadband antenna. Ordered them together, received them quickly. However this does not fit the diamond antenna that it was recommended for. 2 completely different mounting types for what this fits and what the diamond 8900 quadband requires

I did not buy mine from Amazon. I bought it from HRO with a Diamond antenna. The mount however is very sturdy and easy to install and set up. Just take your time.