Lizzie,
As stated earlier in the thread, only a longer antenna can help FM reception, but not by much.
The FM broadcast signal is essentially a straight line from the broadcast tower......a comparatively weak one at that.
Because it is a straight line, and we live on a globe, as we travel away from the tower we begin to go under the signal.....that is where you hear it start to warble and then as you continue, it reaches a point where you have completely dropped below the signal........so, antenna 'Strength' if there really was such a thing, can't help in this circumstance.
Same thing happens to the FM signal in cities with tall buildings.....the buildings obstruct and sometimes absorb the signal....try driving downtown Chicago listening to FM......it'll drive you insane.
Since we're talking radio, the AM signal is entirely different and has a much larger range even though the station may be broadcasting at a lower power. AM grow......a side view would be sort of like a megaphone.....the end you speak into represents the top of the broadcast antenna, the big end represents the signal growing......this continues to follow the curvature of the earth (as well as off into space) so you have far more range.
Add to this, AM signals can 'bounce' off of thick cloud cover, sometimes doubling the range of stronger stations to almost 1000 miles.
Satellite radio is as stated....the signal is broadcast down to earth using satellites as repeater stations......this is why, when obstructed from above such as a bridge, the signal is lost momentarily.
Use AUX to minimize aggravation heh heh.
Be careful out there.....happy holidays,
Rob