996xt gets my vote for a base/mobile scanner.
Homepatrol is great for auto updates if you are in the US and are not familiar with entering frequencies, but if you live outside of the US, it's probably not much benefit.
As long as the systems you are monitoring are not encrypted and conform to the P25 (phase 1) conventional or trunking 'standard', any of the current digital scanners should be able to monitor it.
If you want to record activity, use the excellent (and free) 'Freescan' program and a laptop.
What can go wrong, will go wrong!
FuncubeDongle Pro+ - PSR600 - PSR500 - BCD996XT - BCD396XT - TM9155 - IC-208H, amongst others :-)