Sounds like an interesting thing to do. The 70cm frequency is an excellent frequency for satellite communication and receiving of signals.
There are plenty of other active satellites one can listen to within the 70cm band (432mhz) and the 2 meter band (144mhz). Again you don't need an amateur radio license, just a good receiver and a vertical antenna.
ISS and STS135 (space shuttle) frequencies follow this link.
http://www.issfanclub.com/frequencies
Best Regards Paul vk3da.