AFAIK, the only way that anyone ever received participant status was after they started sending signals to the BT servers. Sorry.
A GPS antenna and an E-field probe should do that for you, provided that you have close enough strikes (the E-field probe is not sensitive enough to receive distant strikes). Otherwise, one or two 4-turn wire loops 1m in diameter should get you started as easily and inexpensively as is possible.
A GPS antenna and an E-field probe should do that for you, provided that you have close enough strikes (the E-field probe is not sensitive enough to receive distant strikes). Otherwise, one or two 4-turn wire loops 1m in diameter should get you started as easily and inexpensively as is possible.