Nothing specific to FL that I know of, but the shark fin antennas are often OEM units or aftermarket replacements for folks who want to replace the standard whip antenna. They can have both AM/FM antennas as well as satellite radio and GPS antennas inside them. Some folks don't like larger whips on their cars.
The small square flat antennas are commonly for GPS or satellite radio.
The little pointy antennas look more like cellular phone or data antennas.
I haven't seen nor do I know why cars would have all of these like this. I could understand a single antenna where someone might have added something to a car rather than using a factory integrated setup.