Topband: "Center-tapped" common mode choke

[Pete Smith]

Apologies for being less than clear - the choke that gave the much 
better results was built on the inspiration of ON4UN's low-band DXing 
book, 4th edition, figures 7-88.  A length of RG-59 coal is used, 
with two stacks of 50 beads each, and a ground between the two 
stacks, using a single short ground rod.  There is no shield ground 
at the antenna, and the distance between the ground rod and the 
antenna input is on the order of 20 feet.

73, Pete N4ZR
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