'Magnetic' Loop Antennas

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M0ROJ's picture
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'Magnetic' Loop Antennas

Does anyone have more information on using HF 'Magnetic' Loop Transmitting Antennas at QRP power with WSPR?
I note that Michael OE1MSB recently posted a few words on the blog about him building a loop antenna with good results at 10W.
However, I'm running a very modest, home-built, dedicated 40M 200mW QRP TX in to a half-size G5RV giving good results but would like to build a dedicated 40M QRP antenna - hence my interest in a loop.
There's quite a lot of info' online but mostly for higher power over a much greater bandwidth than WSPR.
Designs, experiences, results, recommendations, etc, would be very welcome please?
Roger M0ROJ