The signal strengths of the Digital Broadcast TV Stations/Channels are moderate to strong signal strength , most likely will not have to move the antenna.
However , a tripod antenna mount can be moved around on angled and flat roof's.
Some , weight , tied in the center of the tripod will hold the tripod in place when testing reception.
http://www.ronard.com/909911.html.
Use the , ronard(911) , 5 foot tripod antenna mount.
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A low cost way to do testing of reception if you will like to move the antenna around some.
Is use a wooden chair up on the roof as a tempoary moveable antenna mount.
Or you can temporary lash the antenna to the chimney and see what reception is like at that location.
Here are some permanent chimney antenna mounts.
http://www.ronard.com/ychim.html.
Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224) .
http://www.ronard.com.
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The Important Location concerning the location of the antenna for reception is.
Trees and tree leaves , plants and plant leaves , have a Negative Effect on Broadcast Tv Reception and so do buildings and other obstructions including your own roof and building.
Some and not all Negative Effects are.
Absorbing , Blocking , Reception.
Multi-Path Reflecting Tv signals bouncing all around.
The Best Practice is to install the 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.
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Concerning the electric code of wiring and grounding.
The usage of non common word/concepts.
As an example.
The word , bond / bonded / bonding.
Simply means to make a electrical connection that will continue to make electrical connection.
Stores like Home Depot.
Have a electrical department.
And in the electrical department are electric grounding connection hardware.
The grounding clamps and hardware is made with long lasting metal alloys that last a long time outside exposed to the weather.
And copper alloy wire that is made for grounding , for long lasting service usage outside exposed to the weather.
The copper alloy ground wire is , tough hard wire.
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Most Digital Tv's have a , Signal Strength Meter , and some Digital Tv's also have a , Signal Quality Meter.