You mean UHF for 2.4 ...or SHF for 5.4...or simply RF.
I'm quite certain that modifying that antenna connection point is illegal in the US and most nations. Please let us know if this is legit in your nation - otherwise your questions violates the Community Guidelines.
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Please don't accidentally microwave your: fingers, eyeballs or genitalia. You need to study basic Radio Theory and about the section of radio you're modifying. I suggest most Nations' Amateur Radio Technician's-grade test study material. I now remember why doing this does violate Part 15.