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Old 13th Feb 2018, 8:30 pm   #22
G8HQP Dave
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Join Date: Sep 2008
Location: Solihull, West Midlands, UK.
Posts: 4,872
Default Re: My first frame aerial

Small loops actually make poor antennas for both receiving and transmitting. The difference is that for broadcast reception you are receiving a strong signal in the presence of a lot of noise, so a poor (but very directional) antenna can do a good job. The converse happens for transmission - now the noise is at the other end so the weakness of the small loop becomes apparent. This gives the appearance that antenna reciprocity has failed, but it hasn't.
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