I uploaded the sketches as written and got the wrong output. No matter what I tried I couldn't get it to work. I also tried the antenna on another Arduino and it was worse. I think this may only work with this particular type of cheap Arduino and apparently not very well. Update: First, the example sketch they give is awkward because they want you to use their own objects and code. Instead of the standard RF24 code found everywhere. So don't use this IMO, use standard code you can find elsewhere. Second, I found that one module actually works! Of course I had to order another antenna to solve this problem. So their product was 50% cheaper on my order. I assume there is no quality control at the factory.
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