In the back of my spektrum tx module there are two places the aerial can plug into the board.. I plugged it in to the wrong one once and it worked fine indoors at small tracks but as soon as we went out doors I relised there was no range... Swapped the aerial into the other plug and had no problems since.
My module is'nt the pro but it is for the KO 3... I would imagine they would be simliar on the inside, may be worth a try.
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