I have a compustar paging car alarm that worked perfectly before I installed my indash gps stereo. I put the gps antenna right where the paging antenna goes for the alarm, now my alarm wont page me when I lock or unlock the car , or even when the alarm goes off but it does still lock/unlock the car. The gps antenna has a stick magnet that sticks to the window and the magnet that is on the gps antenna sticks to the magnet and it was about touching the paging antenna. Would the magnets mess up the Paging antenna ? and if so is there a way to de-magnetize it or something?
The magnets shouldn't cause any problems however putting the two antennas next to each other may change the tuning on the antennas, they will have been designed assuming nothing next to them. If possible you should try to have a couple of inches between them. That said the effect shouldn't be enough to stop things working, at worst the GPS won't work quite as well as it should. This may be a silly question but are you sure you didn't accidentally knock any of the connections to the alarm loose when connecting the GPS/stereo? One other possibility is that both the alarm and the stereo are probably connected into the the cars CAN bus, there is a possibility of some weird interaction going on between the two but that is a long shot.
