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The loop works great. I was “motel mobile” for the IARU contest and worked LU4AA/F on 5 watts with the loop in our 2nd floor motel room (north/west side of the building) in Ritzville, WA. That’s 1325 miles / watt (your mileage may vary).
The 1st time I keyed up, I had too much RF into the keyer, so I moved the antenna about 3 feet and the problem went away.
One thing that helped me was a long cord on the straight key. I could key the transmitter while I was close enough to the antenna to tune it.
This was my first use of the antenna and am looking forward to using it again.