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This indicates the bandwidth of the aerial
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Nope that's the beamwidth, bandwidth is determined (theoretically) by the thickness of the dipole. The small elements (directors) multiply the signal in a given direction... more directors, more gain in a certain direction.Their length and spacing are fairly critical.
Bigger aerials do not always mean better final signal, their choice is quite complicated and technical if you want close to perfection.
If you are receiving too much signal, an inline plug/socket attenuator between the receiver (TV or whatever) and the aerial feed will reduce the power, but to get it just right you will need a Rectum Paralyser (Spectrum Analyser) or similar to measure the levels you're getting at the receiver... quite expensive!!!
I'm a radio guy, but I know it works out cheaper in the long run to call in an aerial rigger who will have all the tools , and expertise, necessary for a one-off job.