When I took delivery of my 21 199rk, in the driveway, which should pull in a ton of channels, it pulled in none, both on tv and radio. I then took wall plate off and there was nothing attached. NOTHING. I called my dealer and asked him why I paid for dealer prep, when I did not GET dealer prep. After a few phone calls and very firm language on my part as to what I wanted done, they sent a truck to get my trailer. They fixed and or repaired the situation and delivered my trailer back to me in about 2, 3 weeks. These things are whipped together so fast, a lot of systems need to be checked on delivery, AND even when you get it home. Tighten all bolts, tighten all screws, look for connected pipes etc.....