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To get rid of the "dirt" in the Sigma design simply install a coax choke at the feedpoint. The Sigma does cause more RFI then a 5/8 wave if you don't because the coax tends to radiate. I can confirm the choke on this antenna does make a difference at HF and reduces RFI to the level of a 5/8 wave with full radials.

When it comes to full length antennas, to say one hears better then it transmits is probably less then accurate. If it's rated at 1.2 db, that's 1.2 db in transmit as well as receive. About the only antennas that fit that description are small ferrite bars or receiving loops.

[QUOTE="Shockwave, post: 180382, member: 10882"] To get rid of the "dirt" in the Sigma design simply install a coax choke at the feedpoint. The Sigma does cause more RFI then a 5/8 wave if you don't because the coax tends to radiate. I can confirm the choke on this antenna does make a difference at HF and reduces RFI to the level of a 5/8 wave with full radials. When it comes to full length antennas, to say one hears better then it transmits is probably less then accurate. If it's rated at 1.2 db, that's 1.2 db in transmit as well as receive. About the only antennas that fit that description are small ferrite bars or receiving loops. [/QUOTE]

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