I have a setup using a Raspberry Pi, an RTL-SDR dongle, and a portable battery pack. For decoding I use telive, It works okay, and is very configurable. I can configure it on the go using a wifi network it makes and VNC
Some issues I have with it:
It cannot re-tune itself when it gets out of range of an antenna.
Telive has a scanning feature, but I have yet to figure out how to get it working.
It looks like a bomb, and bringing it out in public would probably create a big scene.
My setup is sub-optimal, It's my first setup for SDR and I bought the cheapest parts I could find.