its actually another cable pair where some are connected and some are not. so i can use one wire for that. Its a telephone cable, so i wont be able to push high amps or current through, but yes, i can connect aome generator on our end and use an antenna, i know where the end terminates but incan not access it (its behind a wall plate with a key). someone already gave the hint with a fluke intellitone, which has the abillity to use the sensor as antenna, but i dont know the detection range (i probably need a.few.meters, but it has not to be milimeter accurate)

i can not open the cable in between, its not ours, i just want to use it on howto find out where and how it is layed