Topband: Extreme directivity

[Bruinier at t-online.de]

Hi Ford,
I'm active on 432 EME and topband (both CW only). For 432 I have a 16 long yagi array. The (audio) principle described in the SciAm article would solve all my topband problems. 
BUT: The AUDIO principle works only because of the pulses take place in AIR as medium.
I'm afraid that one would get only sidebands spaced from the 432 MHz "carrier" by plus/minus 1,8 MHz and NIL on topband itself.
Here goes another dream.

73, Jan DL9KR.