I have a 2006 X5.

I will check fuse, but some stations come in fine.

Probably not demister since it is a constant issue

Fuse F86 in the trunk...

All fuses in rear are good.

I had a similar situation and it was due to the power wire to the antenna booster not being fully seated. I had some work done that required removing it.

Any pictures/diagrams of this antenna? I believe the diagrams on realoem are of e39 touring & of no use.

AM, FM or both? The AM reception on mine has always been weak. It was getting worse so I pulled the antenna cable off and sprayed the connections with electrical contact cleaner then plugged it back in making sure it was fully on. The reception improved quite a bit.

I have the defogger problem with the FM reception. When FM is on and I turn on the rear defogger it kills the FM reception.

FM only, now issue with defogger(as I rarely use it). Granted I only listen to ESPN on AM.

Where is the antenna cable?

Inside of trunk lid, at the top...

https://www.newtis.info/tisv2/a/en/e...0i-sav/UlwtXGi

I believe that’s the diversity amplifier. I checked mine & it seemed air tight. I couldn’t pull the connectors off as they were rather small & I felt like I would break them. Perhaps I will disconnect the antenna & spray some deoxit inside the connection. The tabs on that top trim piece love to break off FYI, so if anyone is going after it be careful!!

Exactly - and if this diversity amp looses power, the recption goes to hell... ;-)

Check for power at this amp - if none it could be a broken wire in the hatch hinge loom - not uncommon.