By design FM transmitters are not designed to go very far. Antenna will
not help.

ONLY AM, SHORTWAVE, SSB, and MICROWAVE. The 2 Meter can go far because
of
the repeater station, but that's a different story.

It's not the way the transmitters are designed, it is the behavior of the
earth and its atmosphere at those frequencies. The transmitters are
actually very powerful.

For broadcasting, limited, predictable range is a good thing because it
allows another station to be on the same frequency 100 or 150 miles away
without interfering with it.

Microwaves are even worse -- they travel only in a straight line -- which is
why microwave towers are tall and have antennas aimed directly at each
other. But in that situation the transmitters don't have to be very
powerful.