The reception of the L.A. area Digital Broadcast Tv stations/channels to the northwest are weak signal strength and will require a Winegard HD7084P antenna installed Above the Peak of the Roof in such a manner that the roof and house are not blocking reception to the north west.
Aim the HD7084P antenna at about 323 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here are some strong and sturdy 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 by typing the word ronard in the solidsignal search box or buy from ronard.
Here are some places to buy antennas and etc. .
http://www.solidsignal.com.
http://www.amazon.com.
http://www.winegarddirect.com.
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Install a Winegard HDP-269 preamp.
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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 , or ,
http://www.hollandelectronics.com.
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As always , trees and tree leaves , plants and plant leaves , have a negative effect , multipath-reflections , absorbing , blocking , Tv reception and so do buildings and other obstructions including your own roof and house.
The Best Practice is to install the HD7084P antenna at a location that has the least amount to no amount of obstructions of any type or kind of 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 channel scan for cable tv channels.
Go into the Tv Setup Menu and select the 'Air Channels' ~ 'Antenna Channels'.
Scan for channels.