Length of antenna should be 1.2” exactly (but read on re shielded). Reasoning: 1/4 wavelength is ideal reception. 2.4 Ghz actually is 2.4-2.5 approved range from FCC for this unlicensed ISM band. Therefore best to use 2.45 midpoint. 2.45 Ghz full is 122mm or 4.8'“ . 1/4 wavelength is 1.2”. NOTE: what you can see of the antenna on the board and what goes into the antenna housing is actually shielded coax. I image there’s 1.2” of unshielded up in the antenna. So you need to make sure you have only 1.2” of unshielded. I left the coax soldered to the board, snipped to reasonable length, removed shielding, stripped the 24 gauge wire on the inside, measured how much of that was exposed , then cut a length of 24 gauge wire that, when added to what I exposed, would sum to 1.2”. Then stripped that one, soldered them together, tucked that inside, put back together, and tapped the antenna hole closed. Works better than new.
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