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RE: VHF/UHF broadband antenna apertures
I made a 1-40 ghz bicone with -5 dB worst case rtn loss that was 3" tall and 5" diameter. Scaling that x10, although the diameter doesn't need to be 5x10 inches.
A printed option is the flattened equivalent to the bicone. One with a ground plane is shown in IEEE AP magazine, April 2003, page 901 shows a 0.8 to 10.5 Ghz notch (3:1 VSWR) on a ground plane antenna.
A standard LTSA/Vivaldi/Notch antenna can do it too, so if you need omni coverage (for vertical polarization) use a flat bicone shape, and if you want higher gain at the high frequency, use the Notch antenna.
What is the application?
kch