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I took it off of my chimney. It was strapped to the chimney with galvanized clamps, straps and bolts.
When I got the mess down, I cut u- bolts and straps up to put in the trash can. I am flabbergasted at
the hardness in the 30 year old bolts There was some rust, but they would have lasted many more years.
It's amazing what weather exposure can do to metal. I saw stainless steel pins that were oxidized to the rotating base in radar antenna. We ended up cutting the aluminum portion to get the pins out and get the new antenna up so we could resume flight ops.
When I had a steel roof put on I removed my 30 something year old antenna and ended up putting it in the attic to get over the air broadcasts it still pulls in about 40 stations
One of my neighbors just put up a 50 ft tower and tv antenna. He claims to get over 25 HD channels and no cable bill. But he pay an inordinant amount for his satellite internet.
When I moved in my house over 30 years ago I had one and did not use but left it there for some years. Went to replace the roof and the roofer noticed the chimney broke at the roof line from the wind blowing that antenna around for all those years. You get harmonics and vibration from the wind which added to wind load on chimney.
The funny thing to me is you are taking one down when many people are putting them back up...
Quote:
Originally Posted by John Terefenko
Hmmm, that reminds me of the old video of the long gone Tacoma Narrows Bridge. I first saw the film of it in high school physics class. Later I lived in the NW and drove over the highway where it used to stand. Here is the video if you have never seen old Galloping Gertie.
https://www.youtube.com/watch?v=CsKKDLKYsVU
Quote:
Originally Posted by Mark Blatter
Probably that was what happened. Heard it used to happen more often back in the day.
That was a fairly new bridge when it failed. (less then six months old so no corrosion) it was an attepmt to save cost by making the main support deck structure shallower and thus less costly. In theory it worked fine but it did not have much damping effect because it was too shallow to have the needed stiffness. It had a harmonic frequency that a deeper structure would have damped down. Kinda like a trailer with no shock absorbers jumping up and down.Quote:
Originally Posted by John Terefenko
Bill D.
On edit: wind was only 40MPH. well under design limits.
Lets get back on the topic of TV Antennas.
wow.tough crowd.
Topic cops in the off-topic forum...life's too short.
Quote:
Originally Posted by Lee DeRaud
Agree with this. Mods looking for something to complain about.
Ironic, complaining about complaining...life is too short to complain about moderators doing their job...Quote:
Originally Posted by John Terefenko
Quote:
Originally Posted by Ole Anderson
Doing what job though how ironic it is to complain about a topic that is off topic in the off topic forum. See if you can top that one:) So many times things go different directions, just like this is now, in a thread but it usually gets back on target by itself. Life is too short. Can you say short these days??? Is that politically correct??:)