Ah, I see. I was thinking small numbers were bad.
For some reason, I was fixated on antenna gain. I'd still like to know what the gain is (even if it's so small that it's negative compared to the 0dbi isotropic standard).
Anyway, for now, so that I have a calculation to compare to the real- world results, I'll simply use 1dBi for starters - and if that doesn't come up with the real-world experience - I'll lower the dBi numbers in the calculations accordingly.
Now I'm going to move on to the rest of the calculations of range.
Thanks.