Directv and Comcast question

I have searched the forums but have found nothing. I have Comcast internet that I have to keep for the next 5 months, but I want Directv so I can get NFL Sunday ticket. I'm leasing the place I'm in and I don't think my landlord will let me have another hole drilled into the wall for a separate modem line from Comcast. Just using the one cable going into my living room, is there any way using the diplexers that I can get both Comcast internet and Directv in my house? Thanks!!