NONE all beesting type short masts will all suffer bad reception
Just cut the one that's on car
yes the shorter it gets the worse it will get
if you were to cut it you would need a cap to go back on top
but that is a thing a would not recommend unless you have a spare
the sri mast is the smallest option but still big
the standard mast is the biggest by about 2 inch or so
Tbh I didn't notice any difference on my old car
I have one off a Vw polo on mine reception is fine.
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