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Is the length of a mobile antenna the only factor that determines its tuning?

Can there be anything else added to the internals of the antenna that aids its tuning?

For example, I have a Mitex radio and it's antenna is tuned to 400-470 mhz. Going by this logic, my SDS100 antenna is the same length, so would it perform in the same way to a tuned antenna in that part of the radio spectrum?

If so, why is the length important?
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