So what are my options - Antenna

[TriniGT]

So I am re-running my wiring for the entire car a realized that my antenna wiring in the roof of the car is hacked to f@#k and the antenna amp is missing. What are my options for an aftermarket setup? Also I see that there are three connections on the passenger side rear windscreen. I know one is for the defogger ground, the one on top is for the antenna but what is the one below?

 

[DeanS15]

i'd thought the de-mister would have two connections, it is a heating element after all so current would need to flow in, through and out the other end of it

 

[TriniGT]

Nah I think there is a coil on the driverside rear so that will heat the element and then the grounding on the passenger side.