K9AY simply loops switch

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The K9AY is terminated loop. It consists of a wire loop of any convenient shape (diamond, delta, etc), hung from a single support and with a ground rod at the bottom. A 9:1 impedance-matching transformer is connected from one end of the loop to the ground and terminating resistor is connected the other end of the loop to the ground. This antenna is directional. Favoring signals are arriving from the feed point end. There, with the two loops, you can switch between four directions. You can also change the antenna far field by changing the RLOAD (RTERM) of the loop.

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K9AY
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