Cabling to FM Antenna

I need to cable up a high quality FM roof antenna. Answers to some questions would be a big help. The run is about 75 feet of 75 ohm coax and I will be using an antenna mounted amp. Questions: Is there going to be a big difference between using RG59 and RG6 coax? Can I bend it (gently) and install it into plastic electrical conduit with a 45 degree angle and a couple of right angles or is this a "no-no"? If conduit is a bad idea, how secure coax to run along roof facia and down side of outside wall etc.? Thanks in advance for some good advice