You may find some additional clues in checking out any directional
characteristics. A small loop antenna should be fine for that. An
additional possibility is what is called the "rusty bolt" syndrome. That is
where bad connections - say in metal fencing, etc. pick up rf from different
sources and act as mixers - generating new frequencies (intermodulation)
and transferring modulation from one source to another (cross modulation)
and to the new frequencies too.
Good luck!
73,
Riki, 4X4NJ
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