If a common simple 4 way splitter and the length of the coax runs weakens the signal to the point that KCTU is not received at the 4 Tv's with a antenna in the attic , then install a Channel Master CM3414 distribution amp in place of the 4 way splitter. If KCTU is still weak at one or more of the Tv's then move the antenna to the outside above the roof. Here are some places to buy antennas and etc. ,
http://www.antennasdirect.com ,
http://www.channelmasterstore.com ,
http://www.solidsignal.com ,
http://www.amazon.com. Here are some Strong and Sturdy roof mounts ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/34424560.html ,
http://www.ronard.com/ychim.com ,
http://www.ronard.com. Buy the ronard roof mounts buy typing , ronard , in the solidsignal search box or buy from ronard.