What is one use of a satellite?

Satellite dishes are used to enhance signal reception from a satellite. They are highly directional which means they must be accurately pointed towards what ever signal is wanted.

The larger the dish, the more fine tuned the signal will be.

Antenna's measure reception in Db's much the same as you measure sound. You can witness the Db Gain of your dish if you pointed it towards a noisy road or vehicle then to walk in front of the dish the sounds would be directed and amplified.

You could probably also take of the arms of the dish and use it as a sled or possibly a small raft of sorts.