On Sun, 2 Jun 2013 02:05:29 -0400, "Humbled Survivor"
wrote:

Can I ground out my outdoor FM antenna from the pole?

Does the negative of the coaxial cable have to be grounded?

Which method is best for preventing lightening strikes?

Ref: NEC 810.15, 810.20, 810.21

Both the antenna mast and the signal lead-in (via a listed antenna
discharge unit) should be grounded IAW the above sections.

Nothing prevents lightning strikes but the effects can be mitigated.