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FM is transmitted horizontally polarized like TV, so your antenna should be 'flat'. Generally with low power FM stations they use yagis so they can direct the signal exactly where they want it to go.
With am the big stations use 2 or 3 vertical antennas and can direct exactly where they want the main radiated lobe to go by phasing the antennas. Sense it skips all over the place, polarization doesnt matter. The general rule is bigger is better. All the ferrite rod does is makes the coil appear much larger than it really is.
Im not saying that that the front end and IF doesnt affect it, but antenna is the majority.
I have noticed some degradation with KNX, our local CA powerhouse that any radio, even you teeth could pick up at night through CA, NV, AZ on and on. I figured they just cut their power back trying to save money because of the economy.
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