Attics Are Not a reception friendly environment and Never Will be a reception friendly environment.
Here is the Federal Antenna Law that says Yes you can install antennas above the roof.
http://www.fcc.gov/mb/facts/otard.html.
HOAs / Asho , housing coven-nuts , dead restricted housing , and etc. are well aware of the Federal Antenna Law.
Some keep their mouth shut about the law , Some straight out Lie and say there is no law , and some will say the Truth about the Federal Antenna Law that says Yes you can install and use Broadcast Tv antennas of Any Size for Digital Broadcast Tv Reception so as to have - Reliable - Reception.
Above the roof in such a manner that the roof and the house are not blocking reception to the , south east.
Install a Winegard HD7694P antenna aimed at about 166 degree magnetic compass direction.
Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Here is a antenna mount that works well with tile roofs because it installs up high at the peak of the roof eave.
http://www.ronard.com/34424560.html. Buy the ronard antenna mount at ,
http://www.solidsignal.com , by typing the word ronard in the solidsignal search box or buy from ronard ,
http://www.ronard.com. If using a eave mount then use the #4560.
Or can use a J type antenna mount , Winegard DS 3000.
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No preamp is required.
For 1 Tv connected use no splitter.
For 2 Tv's connected use a common simple 2 way splitter.
For 3 Tv's connected use a common simple 3 way splitter.
For 4 Tv's connected use a common simple 4 way splitter.
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The Tv antenna Cannot be connected to any coaxes that have any type or kind of active pay cable delivered services such as , cable Tv service , cable internet service , cable phone service , or any other type or kind of pay cable service.
Yes the coax cables that are in or on the house can be used with the Tv antenna , if there are no active pay cable services on the coax.
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Here are some places to buy antennas and etc. ,
http://www.solidsignal.com ,
http://www.amazon.com ,
http://www.winegarddirect.com.
As always , trees and tree leaves do a real fine job of reducing or blocking Digital Tv reception and so do buildings and other obstructions including your own house.
It is best to install the HD7694P antenna in such a manner that there are little obstructions to no obstructions of any type or kind in the directions of reception including your own house.
The Tv's Must Channel Scan for the Digital Broadcast Tv 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.
DO NOT channel scan for cable tv channels.