Install DB4 and C5 antennas above the Peak Of The Roof in such a manner that reception is not blocked by the roof and house in the directions of , south west , south , south east , north west , north.
Aim the DB4 at about 180 degree magnetic compass direction.
Aim the C5 at about 187 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
I usually do not recommend the RCA preamplifier.
However you have it , so , connect the DB4 to the UHF connection and the C5 to the VHF connection.
Switch the FM trap filter 'In' so that Fm radio interference is reduced.
Do not use the UHF/VHF combiner that came with the C5.
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For 1 Tv connected use No splitter.
For 2 Tv's connected use a , HFS-2D , 2 way splitter.
For 3 Tv's connected use a , HFS-3D , 3 way splitter.
Buy the HFS splitters at ,
http://www.solidsignal.com ,
http://www.hollandelectronics.com.
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Here are some Above the Roof antenna mounts.
http://www.ronard.com/909911.html , use the 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html , use the #4560 eave antenna mount.
http://www.ronard.com/ychim.html.
http://www.ronard.com.
Buy the ronard antenna mounts at solidsignal buy typing the word ronard in the solidsignal search box or buy from ronard.
Here are some places the buy reception equipment ,
http://www.solidsignal.com ,
http://www.amazon.com.
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As always , trees and tree leaves do a good job of , multipath/reflecting , absorbing , blocking , Digital Broadcast Tv reception and so do buildings and other obstructions including your own roof and house.
It is best to install the DB4 and C5 antennas at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception including your own roof and house.
The Tv's Must Channel Scan for the , OTA=Over The Air , Digital Broadcast Tv stations/channels , often named the , 'Air Channels' or 'Antenna Channels' in the Tv Setup Menu because the Tv transmissions travel through the Air from the transmitting antenna to the receiving antenna.
Some Digital tv's will automatic channel scan for cable tv channels.
DO NOT channels scan for cable tv channels.
Go into the Tv Setup Menu and select , 'Air Channels' / 'Antenna Channels'.
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Digital Broadcast Tv tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
Do a Double Rescan.
http://www.dtv.gov/rescan.html.