Ok here is my generic analogy wavelengths. Radio waves are similar to sound waves in the sense that high frequencies tend to become excited and erratic when obstructed (treble becomes washed out distorted and tinny reflecting off of glass)Microwaves create heat by the waves bouncing off everything...etc. Bass from a car can be heard blocks away before high freq.'s become audible , looking at an audio wave resonating at approx. 45hz, 1 cycle is about 32 feet long , now say 1 cycle at 1khz is 1 inch long. now just by happenstance some freq.'s are gonig to be absorbed, reflected and , some will be just right to penetrate certain materials, I know from experience that UHF paticularly around 450mhz penetrates cement, heavily forested mountainous areas like no other. why? just because! thats the way the wave acts when presented with a certain obstruction...like spaghetti in a strainer< water becaus eif you just mpasses thru , other matter stays trapped unable to penetrate. Ican't explain it much better than that. I know what i mean ;). By the way, by "fm" you mean vhf between 88-108mhz correct? I don't beleive the external encoding/processing of the signal can have much effect, if any on the waves physical behavior... FYI the rf dispersion patterns i've seen from most unity gain antennae looks like a baloon radiating vertically from the tip, and something like say a maple leaf radiating horizontally, loading coils (found on gain antenna's ) flatten the baloon out horizontally which concentrates more of the signal where we are intending it to go... heres some more http://www.google.com/search?q=Antenna+rf+radiation+pattern&btnG=Search&hl=en&lr= so theres my frigging novel on the subject... now lets see who gets it...
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