GRRRR please delete the info in this thread: Useless GSM antenna ?
Wirelss comms is the right place.
I have an Alfa Romeo 156 and it got a GSM antenna wired from the dashpanel up on the roof but it's not connected to a phone.
Can I use this Antenna to get better reseption with wifi or gps?
as for your question I would say no.
You need a proper GPS (active) and WiFi antenna. (wifi may work but i dunno).
GPS 1227 MHz or 1176 MHz
WiFi (b/g) 2.4 GHz
you do the maths