Hazardous Expectations

"If your Hughesnet Service is ever terminated or cancelled, You must return your leased Equipment, and leased Mesh Node(s) (if any), in good condition within 45 days of the applicable termination date or cancellation date or be charged a $300 Unreturned Equipment Fee for Hughesnet satellite-only plans ($100 for the satellite modem and power supply and $200 for the satellite radio), or a $500 Unreturned Equipment Fee for Hughesnet Fusion plans ($100 for the satellite modem and power supply; $200 for the satellite radio; and $200 for the multipath device, power supply and wireless antenna), plus $50 for each leased Mesh Node. "

https://legal.hughesnet.com/ServiceTermsAndConditions-current.cfm

It seems you have the dish installed on your roof. The radio, which is one of the things that has to be returned,  is attached to the dish. You will be charged $200 for it if you don't return it. 

If you want to dispute the requirement as stated in the agreement, section 5 of the subscriber agreement explains the procedure.