I have a new 33CK Greystone (Lst 6 of VIN 248951) that has a nice AM/FM/MP3 player built in. However, there is no outside antenna and the reception is nearly non existent. Lots of fuzz and crackles mixed in with the signal. Was the external antenna simply left off of my trailer? What should I do? Like the trailer, like the radio, but do not like the end result.