Predict your coverage on a map

[ogrevorbis]

This tool from Nautel (the transmitter company) will predict your radio's coverage area given a number of parameters such as antenna type, height, watts, cable loss, etc. You just need to make an account, but it should work for anyone.

support.nautel.com/rf-toolkit/

[ogrevorbis]

I found another tool that seems to work better. It is paid for, but it's only 10 bucks for I think 1000 or more maps.

Check it out here: cloudrf.com/
Best: cloudrf.com/1000%20credits

I'd go with the "best" option cause that's a one time $10 payment for 1000 credits whereas the other payments are monthly.

It's really worth checking out.
You get multiple algorithms for doing the calc. You can even define more custom antennas like yagi or log periodic or choose one from a list.
It integrates with google earth, but there is a new online HTML5 version that runs like google maps right in your browser.