Just to clarify, as earlier mentioned by Nigel OD, the majority of aircraft do not have air to air radar and the only two you will encounter will be the F3 and the Typhoon. But neither will pick you up as both their radars are tuned to pick up targets doing well over 150 kts and even so, the signature of your aircraft would be so small it would probably be either filtered out as ground clutter or be so small that the system and the pilot will not aknowledge it. This test was carried out with the Typhoon and the Grob tutor, needless to say the Typhoon couldn't find it on the radar, I'm hoping that wasn't classified??????
As everyone has said, Mk1 Eyeball is the best thing available at the moment. But the strobes mentioned will definately help as well.
Happy flying.