IMHO the problem the OP is reporting is most likely due to a series of problems that have cropped up with iOS6. Here's an excerpt from a recent article on the subject:
The Wi-Fi version of the iPad continues to experience connectivity issues. The problems experienced most often by owners appear to be the following: 1. Failure to rejoin a known network when waking from sleep mode, 2. Weak signal total lack of signal despite being within close proximity to router, and 3. Disrupted streaming video even when Wi-Fi signal is strong and other iPad applications are working without issue.
Initially Apple failed to acknowledge the issue, but that changed recently with Apple admitting there is a Wi-Fi connection issue with “a very small number of iPad users have experienced issues with Wi-Fi connectivity.” The company goes on to say, “Apple will address this with a future iPad software update.” Here's a link to a whole bunch of articles on the topic:
iOS6 issuesAs noted in the quote the problems can manifest themselves in a variety of ways including
Weak signal total lack of signal despite being within close proximity to routerYou can believe what you wish, but IMO the entire problem experienced by the OP is related to the iOS6 issue. The fact that the Ranger knew that iPads would have trouble connecting to his wifi makes it not surprising that the OP's iPad would have problems.