When it comes to amateur radio, one size definitely does not fit all. That’s especially true with antennas, which need to be just the right size for the band you’re working, lest Very Bad Things ...
Marked: "De Forest Coil / Antenna / Pat. 2-17-03 / 10-11-04 / 12-15-05 / 4-22-06 / Other Patents Pending". This antenna is a plug-in unit for use with De Forest D-17 and D-12 Radiophone receivers. A ...
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