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The air choke should be placed closely to the antenna rather than near the receiver.The air choke should be placed closely to the antenna rather than near the receiver. Place it at the feed-point of the antenna. As an example, when a balun is used with a dipole antenna the balun effectively converts the dipole (balanced) for the unbalanced coaxial cable. Place the balun at the feedpoint of the dipole antenna by creating the coil or using a ferrite choke.