S2SRadio hasn't logged on since Jan. 4, 2011.
I think the question had a hiccup in it.
It's difficult to radiate one watt.
250,000 watts just to set up a 25 mile link is "interesting" to say the least.
Interesting note on communication across water, normally loss is expected as proportional to R^2 thru the air. A coworker said that across water, R^4 is closer to reality than is R^2. Still seems odd, but I believe him since he's alot smarter than me, and he described the info as coming from an expert doing a detailed talk at a communications conference, including measured data. Still seems a bit wacked, and should depend on the heights of the transmitter/rcvr above the water.