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Saving AM Radio

KeithE4 said:
I thought those old hammock antennas were really inverted-L or T systems, with the radiating element being vertical (or close to it), and the multiple "hammock" wires there for top loading (and increasing bandwidth?). They have to be worked against ground, even when using a counterpoise on top of a building, and most of the polarization is vertical. They could still work if designed right.
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TomásEstefan said:
1230 in Los Angeles was still using one of those until not that many years ago. Today they diplex off of the 1580/930 complex on Alvarado St in the Echo Park area.
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IIRC, they shut down that antenna and moved in 2009. From the pictures and descriptions I've seen (from Fybush and others), it was essentially an Inverted-L, with 4 end-fed horizontal wires connected to a single vertical wire, using an ATU and worked against ground. I believe it was the last AM station to use this type of antenna, at least up to now. Being an Inverted-L, the horizontal wires radiated a bit, skewing the pattern away from purely omnidirectional.

A properly installed T antenna's pattern will be omnidirectional and the horizontal wires will not radiate. They'll act strictly as a capacitance hat.
 


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