Your antenna looks like the one that came on our new KZ Spree. It is sold by a company called Continu.us. They do have a web site and technical support. I have talked to their tech support and found them helpful. They sell primarily through distributors directly to RV manufacturers. I have also talked with the distributor that KZ buys this antenna from and found that he did not understand the technical difference between the two models which may be why KZ is selling trailers with no AM radio capability. It is also possible (based on another response to your post) that this style antenna is sold under several brand names from a single supplier in China.
I will probably eventually replace ours with a Winegard Sensar TV only antenna since I am adding a conventional AM/FM mast antenna for the radio.
