I'm not sure if this is what your after, but I'll see if I can help. I'm not a Ham operator, but run Motorola UHF for our farming/trucking operation. I wanted a way to communicate with the trucks, tractors, etc while at the house. I mounted a Morotola UHF radio under the kitchen cabinet. Inside the cabinet, I set the power supply so it's out of site. I have never had a problem with it overheating even with the doors shut. For the antenna, I ran the coax through the kitchen sheetrock wall to the garage, then up the wall into the crawl space above the garage. For an antenna mount I got a large square piece of tin and mounted the NMO mount in the center, then screwed it to the rafters. I just use a regular 3dB gain antenna (can't remember if it was a non-ground or not, wouldn't make any difference as that's why it was placed on the tin) This set-up hits our commercial repeater in the neighboring town 30 miles away with no problems. The only thing visible is the radio under the cabinet. I mounted the antenna concealed in the rafters, because it was simple, looks clean, and far less chance of lightning hits.
Trent