New antenna wiring

[josephdaniel]

I have my antenna on a 35 foot mast above my house right now with the coax going into my room into a converter box total run is about 30 feet long with no preamp and I get about 38-34 channels regularly with no rotor.
My parents have decided they want to cut their sattelite and go back to antenna which we had up until 2007/2005 The want me to run it along the existing dish network wiring that is already in place and wired up to all the rooms (I know I will have to replace all of the splitters and stuff)
there are three rooms each about thirty feet from the splitter and a 30 foot run of rg6 to the 3 way splitter. My problem is is that with the antenna hooded up to the existing coax with all the sattelite splitters removed I only get about 20 channels on the closest TV and 15 on the farthest do I need a distribution amp or a pre amp? Witch ever it is it would need to be able to be mounted outside (not the power supply of course)
thanks