OK, thanks to all the great help here I think I decided on the Winegard HD-8800 antenna.
After S&H, I can save better than $10 ordering it from Winegard Direct instead of buying it in the local Electrician Supply.
I checked the mounting straps that were on the chimney from many moons ago & although there's a little rust on the straps, it looks plenty strong.
I think I'll at least use it for now & if I decide that is a good location, I'll consider buying a new chimney mount kit later.
I will just need to buy the U-bolts with nuts.
For the mast, I'm thinking I might use a section of "galvanized steel top rail" like used for a chain link fence. I already have a new section & it looks to be the same OD, 1.25".
I'm guessing it would be similar in strength to the masts sold for antennas.
About the cable... Winegard Direct only sells a 100' length with ends in place. I checked the distance from were the top of the antenna would be to the TV and 25' would reach the TV with a couple feet to spare.
I guess I could buy a 25' section from another source, but if I bought a 50' length, I would have room for testing the antenna other places on the roof peak, as well as the option of moving the TV if I chose to do so.
Would having the extra, unnecessary cable length take away much from signal?
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