It is quite likely that your antenna will no longer acquire the satellite automatically (the reason for pushing the button over and over) due to its age. How old is your coach/antenna?
Some of the KVH antennas required a receiver with a low speed data port (no longer available) but if you persist the push, push, push option should still get you TV. You should find out for sure if the previous owner had DTV. If not, you need to find a KVH tech with the necessary computer and software to reprogram the antenna for DTV reception.
If you can't get it working I would not spend much money trying to get it fixed when you could buy a new functional antenna from another company that would carry you well into the future.