Recommended · for some experience

Ultimate nRF24L01 range comparison

Why people recommend it

A thorough range comparison of nRF24L01 module variants and antennas by iforce2d, with graphs and a downloadable results spreadsheet.

Watch for: Nearly 40 minutes long; useful before buying amplified or SMA antenna modules

In their words

See [video] for an extensive comparison between different types of modules and antennas.
Gerben on arduino.stackexchange.com, Sept 2015. CC BY-SA.

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