I live in an area where there is much NATO military activity. Often there are various fighter aircraft fly-overs. But none of the common websites such as flightradar24, flightaware and planeflighttracker etc. used for identifying aircraft using ADS-B and ACARS etc, are able to "see" them.
- So apart from ground radar, how does the military aircraft identify themselves?
- Are there other type of transponders used in these?
- Has there been any known attempts at building some amateur radar network to track these unidentified aircraft?
EDIT: As an update for question (3), there seem to have been some success on using SDR's as passive radars, as shown in these links: