Re: Balun works
A balun may only boost signal strength by 6dB or so. Unlikely to be significant for normal broadcast reception.
However, a balun can greatly reduce interference pickup on the coax outer. How important this is will depend on how electrically noisy is your environment. For FM reception you may notice a small reduction in background noise on a decent transmission (e.g. Radio 3) - other stations may never have long enough silences to hear!
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