I have never heard anything from the antena. Sometimes when i have the radio playing it loses signal and sounds messed up. Is there a other wire that i might not have connected from the radio besides the big connection?
I also had a broken power antenna at one point also. Did a little research and the most of the problems are broken masts inside of the assembly. Replaced the mast with an Auto Zone one after the one I got from ebay didn't fit. Opened up the assembly and took out the broken bits out and now it goes up and down every time.
The blue wire off the Pioneer needs to go to the blue wire on your Nissan plug-and-play harness. If your factory radio plug is cut off and you didn't use a plug-and-play harness, then you want to wire that blue Pioneer wire to the OEM black/red wire.