First your FW is a tincan that blocks signals so you need an external antenna or put the extender in a window aimed at the park wifi antenna. I have on the roof a Hawkings Dipole connected to a Smart Repeater router inside.(Google both) Works great to picking up wifi signals. Do a scan and select the park cg to connect with. However this is all dependent on the strength of the signal from the cg and if there is anything in the way of the park antenna to your antenna. Wifi does not travel very far and doesnt like to be blocked by trees, rv's etc and if the rigs between you and the park wifi are streaming HD Netflix, their bandwidth might not be enough for you to get much, as well. We need internet for work and this system helps us get away with less stress.
Happy Trails!