Ok the Tv antenna is a Winegard HD7698P with a Winegard AP8275 preamp. The network Tv stations are in the direction of Atlanta and are weak. The antenna and preamp will supply signal for up to 4 Tv's. The antenna will be pointed at about 189 magnetic compass , here is how to point Tv antennas ,
http://www.kyes.com/antenna/pointing/pointing.html . . The digital channels are the channels to be received. The digital tv needs to scan for digital broadcast tv channels , not cable channels. If you have analog tv's then you need to use a digital to analog converter box. Read and understand this about Real Digital Tv Channels , Virtual Digital Tv Channels , Analog Tv Channels ,
http://forum.tvfool.com/showthread.php?t=695 . . The Correct way to do the RG-6 coax wiring is , at a good location that is easy to get to and has AC power avaliable , will be the splitter , and from the splitter a RG-6 coax cable will go out to each Tv location. If one Tv is connected --do not use a splitter , if two tv's are connected --use a two way splitter , if three tv's are connected -- use a three way splitter , if four tv's are conntcted use a four way splitter. Each time a split takes place the signal is reduced. The Correct Strong and Sturdy way to mount a Tv antenna on the roof is with a , tripod mount , chimney mount , peak of the roof Eave mount. The RG-6 coax lead in wire should be grounded useing a coax grounding block , the best place to ground is the electric service ground wire , do not cut the electric service ground wire , use a split bolt clamp bolt. A cold water pipe can be used as ground , the pipes must be metal and yes you need to scrap off paint and corrosion.