Range depends on height of the antennas (at each end of the link), not frequency, once you're up into the line of sight propagation freqeuncies (starting at around 30-50 MHz).
It will probably take a combined antenna height of 900 feet to reach 40 miles, might take more, might just possibly be managed with 500.
Since your antenna isn't likely to be at more than 50 feet up, it mostly depends on where the transmitter you're trying to listen to is. If it's on a 1000 foot mountain, yep, you could hear it. If it's 100 feet up on top of a building, no, it's not likely.
For reference, Motorola's old 'rule of thumb' for high reliability signals is to take the square root of the antenna height in feet, and that's the range in miles. Add both the receiving and transmitting antennas ranges to get the final range. The actual possible range may be as much as double that, even a bit more, but that's the 'It almost certainly will work with good signals' rule.
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N6IMN - GMRS WQGJ903
Last edited by SkipSanders; 05-24-2007 at 09:03 PM..
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Frequency distance
Linear Mode
