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Manufactures an inductive loop AM radio antenna.
site exerpt
Select-A-Tenna AM Radio Antenna M radio signal strength improvementrequired by most users. The Model 541 producesa signal gain of +30dB when used with most AM radio receivers which have internal ferrite rod antennas. The Model 541 is a passive device that requires no wires,...Articles about receiving antenna theory, feed lines, grounds, bandpass filters and loop antennas for Mediumwave and Shortwave reception.
http://www.dxing.com/tnotes.htm
A collection of antenna links for shortwave, mediumwave and longwave.
http://www.dobe.com/vea/vank6b.htm