Reg has a program that shows bandwidth vs. Cage diameter. My
practical
results achieved greater band width than predicted by the program.
Then
again It was at 30 feet.

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My program, DIPCAGE2, is concerned with the bandwidth of a cage dipole
in isolation.

But the type and length, in wavelengths, of the feedline has a
considerable effect on the bandwidth of the radiating SYSTEM as a
whole. And a tuner, if used, also plays a part.

It is not surprising that practical measurements made from the shack
randomly indicate somewhat different bandwidths. But neverthless the
bandwidth of the antenna itself, as predicted by the program, plays
the principal part.

In general, the bandwidth of an antenna does not increase in
proportion to its efective diameter so much as is often fondly
expected. But it is not a critical performance characteristic.
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Reg, G4FGQ