Comment by HPsquared
I'm going by the BMW E90 (Top HiFi option) which has 3 physical FM antennas FM1, FM2 and FM3, all in the rear glass, and a fourth "FM4" which is not a physical antenna but a combination of FM1 and FM2.
They really didn't want you losing signal!
This isn't even mentioning the festoon of other antennas for DAB, mobile (which has a backup too and phones home in a crash: in case the shark fin is broken in a crash)
I could be wrong, but E90 with the best HiFi package is a very rare exception to the rule. I wouldn’t say you often see such configurations.
It’s cool they did that but it’s almost like they are trying to prove some point — maybe to be the best in the market for FM by a hair. :) One antenna is more common than 3 to my knowledge, by far.