Adam whilst a single land based radar may be incapable of providing an accurate height read out (and as you correctly state - land based radar may not see you at all at low alt) what is about to happen is somewhat out of the norm. All restricted airspace will be monitored by the military using the Air Defence radar network. There will also be several airborne radars adding to the 'picture' at any given time. In summary they will see you (do some google research of the abilities of ASTOR) it will give you a rough idea of military capabilities. If it moves - its tracked. Or as the Americans put it so well 'In god we trust. All others we watch closely'. Aghh sod it, encourage your mates to test the system. It will get me off the Xbox for a couple of hours and it's been a few months since I last fired an ASRAAM