The antenna seems to be perfect for scanner use. It has standard yagi elements and not any bow tie or butterfly elements to increase the frequency range down to 500MHz. All directory elements are focused at 700-800MHz and the dipole are for a lower UHF band. That long single element for 200MHz below that corner reflector can be removed if you do not need VHF reception.
I have one wideband antenna 80-700Mhz with an amplifier built into the antenna and that works great for most frequencies and doesn't need any extra filter or attenuator as it is designed to be connected directly to a tv or stereo tuner without overloading them.
View attachment 81928
/Ubbe