The last link in the chain is to get the WiFi connection about 1,000 feet down to the National Soaring Museum. Yesterday, I set up the WiFi router at one end of that run and walked down to the NSM with my iPad and was able to connect to the router. I logged on to the computer and was able to use VNC to remotely control the weather station computer. No unusual methods required!
That means a simple omnidirectional antenna for the WiFi will probably work just fine. Next week I'll meet with one of the guys from the NSM and get the router installed. Then, it will just be a matter of getting the antenna on the roof and we'll be in good shape for that final link!