Here is some information on Dr. Villard's Anti Jamming Antenna. It looks like 4 foot by 4 foot would be required at least for 1.5 MHz. I will look for more links as I get a chance. I guess the "jamming" could be from IBOC sidebands, but I don't know how effective it would be. Worth investigating though.
http://www.eham.net/ehamforum/smf/index.php?topic=31267.0;wap2
Here's a link that shows how to build it. I have not built it, so I don't know how it works. I would be interested in building one modified for AM BC, especially if it worked to reduce IBOC sidebands. Groundwave and skywave might require different designs for different polarization. Keep in mind that skywaves may have H polarized components even though the transmitting antenna is V polarized.
http://www.iw5edi.com/technical-articles/magic-anti-jamming-antenna
Since it works for 30 MHz, perhaps a different smaller inductance and capacitiance design could reduce FM IBOC.
http://www.eham.net/ehamforum/smf/index.php?topic=31267.0;wap2
Here's a link that shows how to build it. I have not built it, so I don't know how it works. I would be interested in building one modified for AM BC, especially if it worked to reduce IBOC sidebands. Groundwave and skywave might require different designs for different polarization. Keep in mind that skywaves may have H polarized components even though the transmitting antenna is V polarized.
http://www.iw5edi.com/technical-articles/magic-anti-jamming-antenna
Since it works for 30 MHz, perhaps a different smaller inductance and capacitiance design could reduce FM IBOC.
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