Squirrels have fuzzy tails.
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Having omnidirectional transmitter antenna and narrow (like 90 degrees) receiver antenna (horn type for example) you will get what you want in open air. Indoors - lots of reflected signals, too low distances and stuff like that will decrease success rate drastically. Plus it's going to be a pain to build proper receiver antennas. I've been working on a project where we tried to determine distance and direction to "base station" using ISM band transceivers. We were able to get up to 70-80% success rate open air, 60-70% indoors. But there was serious science involved: each antenna was specifically designed, simulated, measured, redesigned... just a pain in the ass. Best way for now - TI CC2431 with location engine, but still not as good as you would like it to be.
We were able to get up to 70-80% success rate open air, 60-70% indoors.
That's good information. I'm glad airman started this post. It turns out I was thinking about the same thing for my yard robot so it could follow me around the yard. It doesn't sound like you were very successful with the RF method. Did you end up going with some other homing method that worked better (like IR). I was thinking about IR, but I would be working in the yard turning, bending over, etc., and I didn't think IR would work very well. I would have to have IR transmitters all over my body so that the robot could always "see" me.