Real-world sample data

Hi all,

I was wondering if anyone knows of a location (HTTP, FTP or torrent)
where I can get some real-world sample data (i.e. a few seconds worth
of the FM, VHF or UHF band). I don’t have the required SDR hardware
yet and I’d like to get started on working out some of the theory
using Octave first before I do.

Regards,
Kuba.

http://kd7lmo.net/ground_gnuradio_ota.html

Does anyone have any UK analog UHF TV sample data? Just before they turn
it
off …

Thanks

D