For the SBS-1 (Kinetics version of the 'Radar box') you need to set your exact home location, as far as I know they don't work very well when moving.
Radarbox/SBS-1 only show aircraft with full ADS-B, mostly newer Boeings/Airbus. CRJs, Dash8s, ERJs, biz jets, mil, GA etc don't show (normally) so it wouldn't be any use in the air.