solid roof mount - NMO

[WSES772]

so the car wash finally ate my nagoya magnet roof mount and mtxa25.  which is wild since its been through several hundred washes.  pretty sure an over agressive top roller got it and *yoink* go bye bye

 

so its time to finally do a permeant mount .

 

looking for a thru the roof option and i see two basic solutions

 

https://www.amazon.com/Vehicle-Antenna-Installation-Extension-Kenwood/dp/B077P26SY3/

 

through mount with attached cable

or something like this

https://www.amazon.com/Anina-Connector-Assembly-Adapter-Mounting/dp/B0DFLMTLD4/

nmo->SO239 and just use a good quality pl259 cable with like a 90 degree adapter on it?

 

i will be drilling the roof of both my silverado crew cab and a 2013 sonic hatchback and burying the cable under the headliner.

 

am i missing a better option?  any experience doing a mount like this - good, bad or indifferent?

i do have steel offroad bumpers and could mount there on my truck, but i'd rather go thru the roof to get the antenna height, especially for around town when i dont have my MTXA26 whip on the roof and i'm running the little stubby.  just trying to avoid losing *another* $50 antenna and $35 antenna mount, while not having to dismount it off the roof every time i wanna  get a carwash


also-  i do have a fiberglass topper on the bed of the silverado, wouldnt be against mounting on there, but that would mean i'd need a ground plane of some type.  i dont want to do a mount with the 3 ground plane stubs coming off it, and know that something as simple as a peice of metal (like even using a baking pan with a magnet mount for outdoor/non vehicle usage) can work as a functional gorund plane.  would it be possible to mount said ground plane inside the fiberglass topper and have it functinal? or would it need to be external to be useful?   Just making sure i'm not overlooking an easy option that allows me to skip drilling a hole in the cab of my truck if need be.


TIA for all your feedback!

[WRYZ926]

People epoxy sheet metal to the underside of toppers all the time. And that works fine for a ground plane. Having good contact between the NMO mount and a sheet metal ground plane is what matters.

[WRTC928]

I don't think there would be room for the Anina NMO+90 degree adapter between the headliner and roof of either of my vehicles. You probably should do some measurements before you decide.

[WSHH887]

On the Silverado. I have a Tacoma and mounted a MTXA26 on a mount that attaches to tailgate area using existing bolts. I happen to have a steel bed cover from Peragon.  This works very well. 
There as several repeaters some distance from me that I can hit. 
 

I have an NMO mount on the bracket. Being tailgate level it is easy to remove the antenna before going to the car wash.