slam_dunk Maybe time to adopt "Regional"guard freqs so practice pan etc. can be done there.
Three miles In Europe there is Radnet - a LAN linking about 25 radar sites. It's possible to select any of the radars at any linked unit, e.g. Rhein could select Pease Pottage - not that the info would help.
Some years ago, when developing the NewODS at Maastricht I suggested that the Supervisor's postion be equipped with a (then) 720 channel transceiver expressly for calling aircraft in our airspace but still on the freq. of another unit and out of their range This was refused as too expensive.