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Here are some above the roof antenna mounts.
http://www.ronard.com/909911.html.
Use the , ronard(911) , 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html.
Use the , ronard(4560) , eave antenna mount.
http://www.ronard.com/ychim.html.
Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224) .
Buy the ronard antenna mounts at ,
http://www.ronard.com , or ,
http://www.amazon.com.
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Home Depot has , 10 foot 6 inch lengths of 1 and 3/8 inch diameter . TOP RAIL , chain link fence , PIPE , that is good for antenna Mast/Pipe . The cost is low at about 10 dollars.
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As always , trees and tree leaves , plants and plant leaves , have a Negative Effect on Broadcast Tv Reception in the directions of reception and so do buildings and other obstructions in the directions of reception including your own roof and building in the directions of reception.
Some and not all Negative Effects are.
Absorbing and Blocking Reception.
Multi-Path Reflecting Tv Signals Bouncing All Around.
The Best Practice for Reliable Reception is to install the HBU44 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 building.