Hello, I've been trying to figure out what these antennas are for but I haven't been able to figure it out yet.

Antenna #1: http://img189.imageshack.us/img189/4194/img2503m.jpg

Antenna #2: http://img683.imageshack.us/img683/2185/img2497s.jpg

They are both in the bottom of the aircraft (Piper Arrow PA 28R-201)... My instructor doesn't really know.. so I was wondering if anybody here knows?

Thanks!