There is some stuff by W5QJR on loops in one of the ARRL antenna compendiums.
His designs are small, thick-diameter, current loops similar to the MFJ
loop. For 7-30 Mhz you may be talking about a loop diameter of 5-6 feet...
if you look at the MFJ and AEA loops which are 10-30 Mhz and about 3 feet.
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