I finished the stereo installation today.
I tried hooking the stereo to the TV antenna and got mixed results. FM would only work with the antenna amplifier turned on. AM would not work at all. Before installing an external antenna I decided to try an internal one. I Installed one of these from West Marine:
WEST MARINE Antenna at West Marine . I simply laid the internal antenna wire inside the cabinet, behind the stereo. The FM reception is now excellent, and the AM reception is marginal. We don't listen to AM, so this is a good compromise. I'll have to see how it works when we are boondocking.
Below are some photos of the stereo mounting sleeve from the front and the back of the cabinet. The factory opening was sized perfectly for a DIN standard stereo. All I had to do was push in the plywood blanking plate (it was stapled in place) and mount the sleeve in the opening. The sleeve is held in place by tabs that are bent outward. You can see these tabs in the photo taken from inside the cabinet. Once the sleeve was in place it was an easy matter to push the stereo and snap it in place.
I chose a Sony stereo similar to the one on my boat. It has a USB input on the front. This allows me to play MP3 music files stored on a memory stick. One memory stick can hold a huge amount of music. Incidentally, I bought the stereo at a Sony outlet store for about 1/2 what it was listed at a major electronics supplier.
I forgot to take photos of the final installation before I lowered the trailer. The ones attached were taken in the lowered position. The speakers are hard to see; you can see a bit of the right speaker in the photo. I'll post better photos later.
Raul