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A choke is usually a coil, or it could be a combination of a coil and a capacitor.  Being as the flag pole goes straight into the ground it wouldn't be easy to choke it, if at all reasonably possible.


I could potentially see gamma matching work as it lets the main radiator be connected directly to ground.


You would want the feed line to connect 1 1/2 feet up or more depending on how wide the flag pole is, otherwise the antenna will be to long which will cause the antenna to start shooting the RF energy up, this would hurt local communications, although DX may be affected less depending on conditions at the time.


Being at ground level you would want many radials, and even more if they are buried.  Make them at least 9' long, even if you have to fold then to fit them in the area of the antenna.


Using a setup like this, I hope you are not at the bottom of a hill.



The DB