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The radio frequency spectrum is arbitrarily divided into "bands" - these are ranges of frequencies. Just like AM radio does not brodcast on the same frequencies as FM radio, VHF TV uses different frequencies from UHF TV.
The VHF and UHF frequencies are far enough apart that antennas can be designed to be optimal for one or the other, or both. A VHF antenna will recive UHF signals poorly, and vice-versa. The VHF band is also divided into two halves, VHF low and VHF high, with FM radio and some other stuff in-between.
Look at your TVFool report and see which stations you want to receive, and what band they are in. This will affect your choice of antenna. There is a chart at the bottom of the listing that is very handy for this.
The FM radio question is interesting. I have some thoughts, but I'll wait for the experts to weigh in.
Pretty sure all you can use from the dish installation is the cable - any boxes, junction blocks, splitters, combiners etc. will have to be removed. So if you have a single RG-6 cable from the roof down, and a single ground wire to the mast/pole, you should be able to reuse those. You still need to follow the NEC rules for grounding that are in the earlier post.
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