Datasheet

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How do I pick/design the right antenna?
Various antennas will cost diferent amounts and give you different directional gain. In general, spending a lot on a
large fixed antenna can give you better power transfer if the antenna is well tuned. For most simple uses, a wire
works pretty well
The ARRL antena book is recommended if you want to learn how to do the modeling and analysis
But nothing beats actual tests in your environment!
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