The Waller Flag is a very good TB RX antenna. Most of the time it is installed
in the vertical plane as it was originally developed and is made rotatable. It
can be as low as 20 feet off the ground although some are put on taller towers.
N4IS has also developed a horizontal version, basically the same antenna, to
respond to horizontally polarized signals. However, the antenna needs to be
quite high to be effective, at least 70 feet and preferably up at 90 to 100
feet to work well.
73, Dennis W0JX
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