No xm radio or traffic reception, but gps works great. I replaced the antenna with the cable to the back of the head unit and still no traffic or xm. Screen says check antenna. AM/FM work great.

What's my next step?

the Z1-Z3 require a seperate module for XM... so if there is an antenna problem, the antenna feeds into the xm module and not the head unit. my guess since you mention traffic is you would have/need GEX-P10XMT. Hope that helps!

Thanks, I'll buy the other antenna and pray it works. I shoulda asked before I bought. At least now I'll have a spare to run in series to collect deep space music.

Work out for you?