If you decide to use TVS-UK for your mobile broadband services I can guarantee that the wireless or hard wired connections will not be breached 100%.

The systems I use are satellite broadband to modem to a wireless router. The wireless router will have a WPA2 key which only the production crew and myself know. This can be changed every day to make it even more safe along with the SSID (name of the router) the other service I will provide too is on every 2nd day I will change the router for a different make and I will be onsite 24hrs a day while on location and using my services and can monitor the broadband access onsite with hourly checks and users.
   
The production office can be hardwired internally so no one can access the network instead of using a wireless signal (I will need half a day to do this before start date)
   
With satellite there is NO way of hacking the signal via the cable from the dish to the modem which will be based in the production office under lock and key. From there it will connect to a wireless router or a hard wired switch which will then be hard wired to the rest of the production office.