I'd always assumed it was simply the receiving aerial being detuned by the 
bridge.  I once retuned my 160m mobile aerial under a similar 'obstruction' and 
I could hear signals again.

Just a thought.

Cheers,

Martin
G4FKK

"'Geri' Kinzel, DK8KW" <[email protected]> 04 October 2001 18:16:10 >>>

Hello LF group,

I went to Holland recently, and listened to Deutschlandradio on 153 kHz. I
have already noticed years ago that mediumwave and longwave signals are
being attenuated or even completely faded out under bridges. Now, listening
to that radio transmission not too far away from our 136 kHz band I asked
myself some questions: