I mounted my 2 meter antenna on the front fender of my 2013 Ford F150. The only place to mount the antenna is not flat, but slopes a little to the outside of the truck - so the antenna sits at an angle pointing out away from the truck.

The AM/FM radio antenna is mounted on the other fender with an offset mount which allows the antenna to be vertical.

I'm looking for an adapter for my NMO mount which would allow mounting the antenna vertically. Ideally, it would be NMO to NMO.

I can visualize the problem you have as I had it once on car trunk mount that wasn't flat. I ended up bending the antenna slightly so that even though the mount was angled, the antenna remained true vertical when the lid was closed. If you have already drilled a hole in your fender for the NMO mount, I'm not sure of any other solution. I've never seen a swivel as you describe, but I guess you could always have one fabricated at a machine shop.

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