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The Star-H or KinStar antenna developed and marketed by Kintronics is being used by a live AM BCB station here in Oregon; KCST AM. Here is the link to a “Radio World” story on the station and the antenna:
KCST AM-Florence, Oregon, is licensed for 900 watts and has one of the better signals on the coast; at least nearly equal to the 50 KW box a few miles to the south in Reedsport. Radio stations right on the Pacific Ocean coastline don’t produce a great ground wave signal over land customarily (ground conductivity is poor and salt air destroys ground systems).
The article is pretty self explanatory. My company has been looking at installing one of these systems near an existing airport for sometime. In commercial service the only drawback is the complete required antenna proof when its all installed to prove to the FCC it will spec out to their standards.
Just a guess, but this antenna would not present measurable or perceptible signal increases for Part 15 stations with only 3 meters of allowable conductor length (FCC considers only the total length, not height or width).