am/fm antenna & parking sensors questions
 

The mast on my power antenna is broke and I figured every other maxima has a broken one or gets stolen so why bother. Has anyone ever used these interior am/fm antenna's behind tinted windows? I'd like to mount it in the back
http://cgi.ebay.com/AM-FM-Car-Truck-...ht_8819wt_1250

Also has anyone ever used these reverse sensors?
http://cgi.ebay.com/ebaymotors/Car-L...fAudioQ5fVideo
The same idea, mount the sensors in the trunk and put the display by the 3rd brake light so everything is out of view and you can see it when you are backing up.
Reason why I ask is I am TERRIBLE at parallel parking. And I have to from time to time.