A Shakespere CB whip in my 66 Corvette which was advervtised for fiberglass cars. It couldnt be heard a mile away with 4W. I added "radials" from the base on the rear deck to the frame on all 4 corners and then it worked much better. This was back in the late 70's for several years.
CB antenna manufacturers live in a fantasy land, and almost always grossly misrepresent what the sell.
A half wave CB whip is about 18 feet long. It is impossible to use a half wave whip on 11 meter mobile on a normal highway or road.
You likely had an antenna with 1/2 wave of wire spooled up on a short fiberglass rod, which would never behave like a half-wave.
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