If you're bleeding into other channels, you're probably over modulating, rather than using too much power.
I run 4 Watts on a slightly directional antenna and it covers 2 miles. Unless you're sitting in my driveway, you don't hear it on other channels. While Ian did a good job of getting LRN to have a consistant level and good density, don't expect to be as loud on the dial, as other broadcasters.
I find that the Republic Broadcasting Network has some good, live, and liberty oriented programming. When re-runs of the "less exciting" shows come on LRN, I switch.
Watch out though, RBN has some shows about children being sacrificed in Mormon temples and HAARP causing our severe weather. While entertaining, I don't think it's the message I want associated with Free Minds Radio.
Eventually, I'll get a Barix internet radio, that's what the big boys use to monitor their streams.