We purchased a USB adapter with a high gain antenna, with the same results we were already getting, however...
We are going to move to another campground. I spoke extensively with the owner about our need to have internet, since it is our income. He explained how their system is set up, and I am unfamiliar with the brand of wireless AP they are using, it comes from Quest, the phone company in Colorado. Anyway, he has other people who are not in the wifi range so he is looking for solutions, and suggested maybe I could help him with the set up. Not knowing anything about their current equiptment, I'm not sure I want to go dancing around with their internal settings, but if your new EnGenius universal repeater does what I'm reading it does, this could be a great solution, not only from the standpoint of setting up repeaters to spread access through the campground, but if they ever have to change IP's and equipment, the units you suggessted could be a realy saver.
Can you give me a little more info, and if we need help in configuring it do they provide a good support staff, and what if, (heaven forbid), it doesn't work the way it is supposed to with their setup? So, even though your unit wasn't right for me, it may fit the bill for other needs here soon.
Thanks for the advice and for bringing this item to my attention, I've been fighting a nightmare with the set up they have here.