Keeps coming up no antenna detected...changed antenna ...same problem

If you're using it with a SXV300 or SXV200 add-on tuner, there's a known issue where there's a poor connection between the antenna plug and the jack on the tuner. Plug in the antenna, then pull the cable down so it keeps a bit of tension on the plug. Use zip-ties to secure the antenna cable to the side of the tuner to keep up the tension.

If it was working before, check whether the signal is coming from the DVD or not, rather it is detected by the TV. Try changing the RC cable.

Several possiblities: one: antenna really is bad - borrow a friends Sirius or XM antenna and plug it into the base and see if the message goes away -if it does, replace antenna; if not, then your 'dock' or base could be bad - try removing and reinstalling the radio or try another base. If another base and antenna don't solve it, then the radio is shot and it's time for a new one. Customer service will ususally give you a great deal on a new XM radio IF you agree to keep it for 1 year. Let me know how it goes.

Static won't come from an antenna. It normally comes from your connections. If you've been changing the head, check the contacts where it goes together. The only noise your antenna will pick up, is noise from your ignition. If what you hear is more of a buzzing or clicking that changes as you accelerate, then you should get your ignition checked.

Either a dodgy power supply that keeps getting cut off for brief moments, but long enough to disrupt the power.

Or

A graphics board problem. I've seen multiple compluters runnig 2 screens where the second screen whould randomly go black and come back with the detecting analogue/DVI signal. This was solved by switching to an Nvidia graphics card

What kind of antenna is used. Outdoor antenna or indoor antenna. The main board only detect the signal with certain level, if the signal strength is not enough, it will pass by. Since the change of signal from analog to digital this problem got more depending on your location. You need to use a booster-antenna to over come this problem.

the radio settings are not turned on to the right settings.

try this:
if the antenna is the kind that takes a power adapter to power try moving it away from the converter box and try changing frequeny on antenna this problem is usually for cbs channels...

i had the same problem and had to return the antenna to radio shack to get a replacement. the guy said that the antenna had a crack in it from the cold weather or water got into the antenna and that is why it malfunctioned.