There is a thread in the tech forum about ways to increase wi-fi performance. This device is supposed to be good, but I haven't personally tested it: weBoost Cell Phone Booster
This would have nothing to do with WiFi. This device only improves cellular
Check out the article I wrote on the subject here:
www.rvbprecision.comAnd the best thing you could do is subscribe to RV Mobile Internet. One of the BEST resources I've ever found having to do with cellular and WiFi for RVers.
http://www.rvmobileinternet.com