Satellite TV SET UP

A little bit more information, my satellite it is mounted on the roof it’s a dumb style, and then the wiring runs to the roof down the wall to the receiver and then using coaxial Cable goes to the splitter box I have turned off the booster button and then the TVs are all connected with the factory cable that runs through the coach to the TVs. When using the satellite hooked up that way the pictures on all three TVs have a snowy picture. If I run directly from the satellite receiver to the TV in the front with a 10 foot HDMI cable to an HDMI port on my TV the picture is crystal clear so from the dome on the roof to the satellite receiver that must work because it does send a signal to the TV that is crystal clear if I use the HDMI cable so my thoughts are from the receiver going through the splitter that’s where the problem lies. My thoughts are to replace the splitter. All connections are tight but yes there could be a bad connection but the problem goes to all three TVs and I’m thinking it could be a bad splitter so I’m going to try that today. Although I did have a satellite installer recommend going to a wireless HDMI system to all three TVs and they do make wireless systems to handle up to four TVs according to him. But I’ll try Replacing the splitter today and see what I get.