Quote:
Originally Posted by dprljackson
Yes I know that. That's why I said a doubling of the distance results in a quarter of the field strength. To make up for that factor of 4 drop off, it seems like the antenna would need an additional gain of 6 dB.
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My apologies. I reread your post several times and completely overlooked that you had it right.
As Tower Guy alludes to, the mileage claims are completely subjective estimates by antenna manufacturers. When we didn't have ready access to the data to properly model all the RF paths, this was the best measure available. Now that you can quickly determine antenna gain requirements for reliable reception, you can do the tradeoffs yourself.