Even if it's a two-way dish setup you will need a phone line for initial signup for internet. Which you must already have since you posted here. I wasn't impressed with DirectPCs' company support. I had a modem go down and they never answered the phone after 45+ minute waits leaving me on hold. So I discontinued the charge to my account {which they didn't understand very well}.
StarBand and SkyBlue might still do internet, I'm not certain.
Just Google it and I'm sure you'll get a few good hits.
Good luck.