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First, to clear up a common misconception, it’s not 100 mW of RF output, it’s 100 mW of DC power input to the final section of the RF amplifier. Huge distinction. The efficiency of the transmitter in turning that 100 mW of power into useful RF differentiates one transmitter from another. It’s likely that none of our transmitters get anywhere near 100 mW out, so 150 mW output is easily double (or more) what a person would expect.
The question might be better put as “how can we get more OUT of the 100 mW IN?” 5% components instead of 20%? adjustable components rather than fixed value?
Same thing with the antenna. Too long is too long, but how about trying a capacitive hat, or center or top loading, or one of many other configurations?
Good faith experimenting sounds more interesting to me than cheating, anyone can do that 🙂