As you can see, there are many opinions about coaxial cable. What it boils down to is this:
How much are you willing to spend to hear more stuff? Some of this has to do with where you live. For example, in a city or close-in suburb, you probably don't need the low loss or the fancy stuff, so even cheesy "RG-58 Type" is often enough. (the "RG-58 type" is not really RG-58, but it kinda sorta acts like it at lower frequencies)
On the other hand, if you live in the sticks, with the nearest civilization being a hour's drive away on the highway, then you really should invest in good coax and good antennas, a decent size pole and so forth.
Good luck!