I'm using EFF-1.4.2 to scan the strength of radio frequences.

I've adapted it for my uses, for experiments.

The original program asks for a headset as antenna.

I've eliminated this condition.
But now the file "fm_rssi" gives only the value of "-122" which equals: not defined.


Is there any possibility to use the frequence scanner without external antenna?
Which parameters have I to change?
("dac_output", "audio_route" or the dbus request?