Well, I can see why you didn't get any answers.
1000ft is going to be a problem. All your robot has to do is go around a corner and you've lost the signal. Even if it could be made to work at 2.4Ghz, you're going to have link problems due to obstructions. The robot will probably need an omnidirectional antenna, but these have a fairly narrow vertical radiation angle. Can you insure that the antenna will remain vertical to within perhaps +/-5 degrees of vertical? Most robots cannot. Also, your control point might need a dish or panel antenna that somewhat tracks the robot to withing about +/-15 degrees. Is this practical?How about some clue as to your bandwidth requirements? Are you belching video in which case you need at least 150kbits/sec thruput? Is your control one way analog, in which case a model airplane radio control will be sufficient? If bi-directional, do you really need
802.11 performance, or will a 900MHz unit with perhaps 115Kbits/sec thruput be sufficient (especially if it penetrates obstructions better and has much longer range)? Basically, I need to know what you're sending, how much, how fast, and over what topography, to offer any useful suggestions.Also, are there going to be other robots (i.e. Robot wars style competition) active at the same time that might use 2.4Ghz for either
802.11g or video? If so, you might need to deal with an interference problem.