Large Directional Antennas are good for HD TV Reception up to 100 Miles with Pre-Amplifier usage…
For Long Range Directional TV reception, there are typically 3 major types used; Corner Reflector, Yagi and Bowtie, not in any particular order.
Some of these Antennas are of Large Profile and Typically have a Asthetically Distictive appearance which can be of Concern when dealing with Home-Owner and Condo Associations. Their Extremely Large size prohibits some of them from Attic installation. If You enjoy a rather Spacious Attic, some Considerations would be; to keep wiring and other metal obstructions away from the Frontal view of the Antenna as not to impede reception in that Direction, and that any Amplifier that you might be using to enhance reception and/or distribution to other TV sets in the house be colocated with the Antenna as to reduce loss of signal unnecessarily due to distance between the Antenna and Amplifier, as well as to offset any loss in Antenna Gain from Roofing Materials used in Construction.
Indoors or Out, I always try to Mount the Antenna in a Position and Fashion that will lend itself to a maximum Angular view of the Horizon so a sweep with the antenna can be performed through and Past the intended reception Direction(s). This will insure that you are centered on Target (finding the "Sweet-Spot" for them all), and that if there are other Broadcasts available to you that were unknown previously, you can amend/supplement your current Antenna installation to add these New Channels to your Stockpile.