This article is from the Old Time Radio FAQ, by Lou Genco webmaster@old-time.com with numerous contributions by others.
Several readers have been acclaiming the GE SuperRadio III as an
excellent choice for picking up distant AM stations that carry OTR
programming. Although the tuning dial has notoriously poor
calibration, the sensitivity and selectivity seem superior to other
radios.
Some readers have had good success with the Select-A-Tenna antenna
advertised in several magazines, and the Grove Catalog. The S-A-T
seems to be rather directional, and may eliminate off-axis
interference.
Ham Radio magazines sometimes carry information about small loop
antennas for AM DX-ing. Some pointers to instructions on how to build
them are at http://www.old-time.com. Also, Dan Hughes
(dan@soltec.net) left this note:
Several years ago one of the electronic magazines ran
plans with dimensions and number of turns, etc to build
one of these antennas. I have built several and I'm no
mechanic. If you (or anyone else reading this) would
like a copy of the article and plans, visit my website
at http://members.soltec.net/~dan
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If you are interested in AM Broadcast Band reception, and technical
articles related thereto, send a SASE to the following address for
their product catalog:
National Radio Club
Publications Center
PO Box 164
Mannsville, NY 13667-0164
(The National Radio Club also has a WWW page, at www.nrcdxas.org/)
 
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