I have the KDC-X890 HU along with the SIRKEN1 Sirius tuner. The sound is always fine. Here's the problem. The data from Sirius is incorrect on the HU display ONLY when the FM antenna is connected. Have replaced the Sirius components & the FM antenna, cable, etc - still have same problem - Nobody has ever heard of this and both Kenwood and Directed Electronics (manufacturer of the SIRKEN1) have made no useful suggestions. Currently all is fine as I have the FM antenna connected to the back of the reciever, but disconnected under the hood where the mast meets the cable. Suggestions? Could this be a compatibility problem or possibly bad HU?