Reliable reception will not happen with the antennas in the attic. The antennas Will Be Mounted Above The Roof in such a way that the antennas have plenty of elbow room and big thick dense trees are not blocking reception. You Will Use a UVSJ to combine the antennas with , you Will Not use a two way splitter to combine the antennas with. A AP8700 or CPA-19 preamp Will Be connected to the output of the UVSJ. OR you can use a Winegard AP2870 preamp in place of the UVSJ and the other preamps , The AP2870 has a input for the C5 VHF antenna and a input for the 4228HD UHF antenna and then one output from the AP2870. . The C5 is for reception of the VHF high band channels of 7 thru 13. . Here are some STRONG and STURDY antenna mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim/html ,
http://www.ronard.com. Buy the ronard antenna mounts at solidsignal by typing the word ronard in the solidsignal search box or buy from ronard.