I saw this bit of kit on another forum, and thought it might solve the terrible radio reception I had with the little roof mounted aerial, because a 90 needs a LOUD radio!
The splitter
Zetagi DX27 CB Radio Splitter | Filters | THUNDERPOLE doesn't need a power supply, and has really improved the radio reception. It runs off the red flexy aerial shown.
My only proviso is I haven't really used it for CB operations as the opportunity hasn't arisen. I have however picked up somebody's CB message, and it seemed clear enough.I thought it was worth a £20 shot anyway.
Hope this helps!