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The following information also applies to your other post that is the same location and the questions an pictures of the chimney.
Above the Peak of the Roof install 2 antennas on the chimney so the roof is cleared in the directions of , South , South West , West , North West.
Here are some chimney mounts.
http://www.ronard.com/ychim.html.
Measure around the chimney and use a , ronard(2212) , ronard(2218) , ronard(2224) .
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Install a Antennas Direct , DB8e UHF channels 14 thru 51 antenna.
Aim 1 panel at about 210 degree magnetic compass direction , for reception of the UHF Tv stations to the , South , South West , West.
Aim the other panel at about 338 degree magnetic compass direction , for reception of the UHF Tv stations to the , North West.
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Also install a ,
http://www.antennacraft.net.
Y5-7-13 VHF high band channels 7 thru 13 antenna aimed at about 209 degree magnetic compass direction.
The 209 aim direction will receive , WNAC-DT Real VHF high band channel 12 FOX , and , WPRI-TV Real Vhf high band channel 13 CBS.
And WMUR-TV Real VHF high band channel 9 ABC will most likely be received at the back angle to the Y5-7-13 antenna.
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Here is how to aim antennas ,
http://www.kyes.com/antenna/pointing/pointing.html.
Use a Real and Actual magnetic compass to aim antenna , do not trust a cell phone compass.
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Install a ,
http://www.antennacraft.net.
10G221 preamplifier.
The DB8e UHF antenna will be connected to the UHF connection of the preamplifier.
The Y5-7-13 VHF high band antenna will be connected to the VHF connection of the preamplifier.
The preamplifier will be operated in the Separate antenna mode.
The FM radio interference trap of the preamplifier will be in the , in/on position.
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For 1 Tv connected use No splitter.
For 2 Tv's connected use a , Holland Electronics , HFS-2D , 2 way splitter.
For 3 Tv's connected use a , Holland Electronics , HFS-3D , 3 way splitter.
For 4 Tv's connected use a , Holland Electronics , HFS-4D , 4 way splitter.
Buy the , HFS-2D , HFS-3D , HFS-4D , splitters at ,
http://www.hollandelectronics.com , or ,
http://www.amazon.com.
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Home Depot and Lowes have Grounding supplies , Copper alloy wire that is made for grounding and all manner of clamps for grounding connections.
The First choice for ground location is the ground of the Electric service location.
The ground wire can be run down the roof.
The coax can be run down the roof and one easy way to route the coax off the roof is to route the coax down through the eave rain gutter down tube.
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Also with most installations , the coax is taped to the outside of the mast pipe so the coax does not swing in the wind.
A better way is to route the coax up through the inside the mast pipe and out the top of the mast pipe , the coax will not swing in the wind , inside the mast pipe.