if you are talking about a USB Wifi stick for PC's ?
does the iPad have a full size USB port ?
if so try it..
But i really doubt it will work
for in the RV or house you can get a WIFI repeater/amplifier that will pick up an access point signal and increase relay/increase it
i don't know of anything that plugs into the ipad for on the go portable use to increase signal
might try some ipad forums to look for such info