For reliable reception of Many Digital Tv Stations/Channels , above the roof in such a manner the roof and house do not block reception to the , west , north west , north east , south east.
Install a Winegard HD7000R antenna aimed at about 260 degree magnetic compass direction,
Here is how to aim antennas ,
http://www.kyes.com/antennas/pointing/pointing.html.
The HD7000R antenna does have some forward antenna gain and also receives to the , front angles and back and back angles of the HD7000R antenna to the Tv transmitters directions.
Here are some above the roof antenna mounts ,
http://www.ronard.com ,
http://www.ronard.com/909911.html ,
http://www.ronard.com/ychim.html ,
http://www.ronard.com/34424560.html if using the eave mount use the #4560.
Buy the ronard antenna mounts at solidsignal by typing the word ronard in the solidsignal search box or buy from ronard.
Can also use a Winegard DS3000 , J pole type antenna mount.
Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.winegarddirect.com.
_______________________________________________
No preamplifier is required.
For 1 Tv connected use no splitter.
For 2 Tv's connected use a simple common 2 way splitter.
__________________________________________________
As always , trees and tree leaves do a good job of , reflecting , reducing , blocking , Digital Tv reception and so do buildings and other obstructions including your own roof and house.
It is best to install the HD7000r antenna 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 Digital Broadcast Tv Channels , often nemed 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 automatic channel scan for cable tv channels.
Go into the Tv menu and select the 'Air Channels' / 'Antenna Channels'.
DO NOT channel scan for cable tv channels.