First. Internet TV takes major bandwidth (Show I just downloaded is 941 MEG for an hour. call it a gig an hour and you will be close) not many parks can support multiple video streams. and often the wi-fi is not that good (last park I was at a one hour show took 4 hours to download).
Now DISH network Sat TV.
Dish has programming scattered across THREE satellites. DOME and Cube antennas (Like the tailgater) can see ONE at a time. oh it can see all 3 but only ONE at a time so if you have a SINGLE channel receiver like the VIP-211 line.. Great. but if you have a DVR (Most are at least dual channel) or multiple receivers.. You will have conflicts as one wants one bird and the other is in control.
Dish type antennas (Ground mount tripod) have solo. double or triple LNB's and can see 1 2 or 3.. The correct dish works, period, NO conflicts.
ROOF Mounts are not good if parked under the evil signal eating Tree
The ground mount or portable.. No problem.
DirecHDTV (Direc is dropping sd I'm told) no dome or cube currently exists for DirecHDTV far as I know.. but I'm not current on that.. Again DISH type antennas..> Work.