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I'm just wondering if putting a five element marine band yagi with a rotator on it and on a 8 foot pole is safe on a chimney ?
Has I have seen various videos on youtube of yagis on chimney s !
Having seen for many years, people having their TV antennas and rotators mounted on their chimney's, all I can say is way back when workmanship meant something, even those chimney's developed cracks and started to come apart. Remember, a chimney is designed to only hold the downward weight of the bricks and mortar. They are not designed to withstand side way momentum or heavy vibrations.
Placing an antenna and rotators on a chimney exerts forces that the mortar and brick were never designed to stand up against. The higher above the chimney you place this force, the faster the chimney will come apart.
Bear in mind that it may seem like a fine place to place your antenna on. It's a high spot and the mounting straps are available all over the place at a cheap cost. But at what cost are you saving when you have to hire a company to come in and have them re-build a chimney that was probably in good shape before you made a bad choice? How much is it going to cost to repair your roof when the bricks fall off and put a hole in your roof? Ever see a chimney crack about 3 feet down and topple over?
You would be much better off using a house bracket that bolts to the side of your house. Just make sure that you tie in the lag bolts to the studs and not rely on the siding to hold up the antenna bracket. If not, your now looking at repairing the side of your house.
An even better solution is to put up a tower or use a roof bracket stand to hold your antenna. just remember to seal up the holes where the lag bolts go into the roof. make sure you tie the bolts into the roof rafters so you don't rip the roof up from high winds in a storm.
Keep the mast as short as possible. The higher or further the load (antenna and rotator) is above the mounting point, the more the forces are on the mounting bracket or brackets. You can't change physics.
Chimney mounts
I agree with all those who say avoid a chimney mount if you can. You're better off going to the Lowes or Home Depot, buy a 20' piece of fence top rail, and mounting it on the back of the house or a fence post next to the house. If you're nervous that your 5 element beam and rotor will fold the top rail, there's your sign that the chimney mount would of been too much of a strain.
But if you truly have your heart set on a chimney mount, the thing you want to avoid is the straps digging into the brick and mortar. Running some cheap angle iron under the straps (a cut up bed frame can be had from thrift stores) the length of the chimney, and spacing out the two straps as far as possible will alleviate a lot of the strain. If you think it's gonna be up there for more that a couple years, give the angle iron a couple coats of paint first so you don't have rust trails running down your shingles.
Having seen for many years, people having their TV antennas and rotators mounted on their chimney's, all I can say is way back when workmanship meant something, even those chimney's developed cracks and started to come apart. Remember, a chimney is designed to only hold the downward weight of the bricks and mortar. They are not designed to withstand side way momentum or heavy vibrations.
Placing an antenna and rotators on a chimney exerts forces that the mortar and brick were never designed to stand up against. The higher above the chimney you place this force, the faster the chimney will come apart.
Bear in mind that it may seem like a fine place to place your antenna on. It's a high spot and the mounting straps are available all over the place at a cheap cost. But at what cost are you saving when you have to hire a company to come in and have them re-build a chimney that was probably in good shape before you made a bad choice? How much is it going to cost to repair your roof when the bricks fall off and put a hole in your roof? Ever see a chimney crack about 3 feet down and topple over?
You would be much better off using a house bracket that bolts to the side of your house. Just make sure that you tie in the lag bolts to the studs and not rely on the siding to hold up the antenna bracket. If not, your now looking at repairing the side of your house.
An even better solution is to put up a tower or use a roof bracket stand to hold your antenna. just remember to seal up the holes where the lag bolts go into the roof. make sure you tie the bolts into the roof rafters so you don't rip the roof up from high winds in a storm.
Keep the mast as short as possible. The higher or further the load (antenna and rotator) is above the mounting point, the more the forces are on the mounting bracket or brackets. You can't change physics.
+1. I have seen many chimneys over the years that were damaged by antenna mounts, usually TV or CB antennas. It's not a pretty sight, especially when one collapses. Let the chimney be what it was built to be, a chimney. An eave mount or a tripod will serve your needs and if properly installed is a lot less likely to damage your home.
When I first got into ham radio, I had one mast on a vent pipe and another mast anchored to the chimney with straps. This was up in NJ, which was relatively safe, but on occasion we'd get a nor'easter or hurricane come through. So, I had a TV rotor (very light duty) with an 11 element 2 meter beam on top (that's very close to the marine frequencies). Never any problems with that. Then I added a 10 meter monobander (it was pretty light). No problems with that. Then I changed the rotor to a Ham 3, with schedule 40 pipe. I put a Moseley tri-bander up (along with a 2 meter antenna and a 440 yagi). It was fine for a while. Then it blew over in a windstorm and took the chimney with it.
So, I lived that "chimneys are made to be chimneys" thing. The other consequence was that the fall damaged the roof and also sent some bricks down to the driveway. Not a good thing, as until I could afford to fix the roof, I had water coming in every time it rained. It was just a disaster.
If your chimney is painted over and maybe even tarred, you have no idea if the mortar is spalled, if the bricks are cracked, etc. All of that affects mechanical integrity. If the chimney is in good condition and you put a light weight antenna on it (note that most TV antennas are extremely flimsy), you'd probably be fine. The more you hang off that bracket, the more force it will transfer to the chimney. The guys are right. Chimneys aren't made to deal with that. With enough crap up there, you'd eventually end up like I did when I was a kid.
Wyandotte I don't mean top heavy on chimney I mean I have 30 foot pole allready starting from just above my back kitchen to a couple a feet above the chimney which with the windy conditions has been moving around and if I put rotator on it would be dangerous !
I would put a photo on hear but I don't know how to do it
So to be clear, this pole is mounted to the side of your house? Or am I misunderstanding? Is it attached in more than one place, i.e. also at the eave? If so, and it's moving around like that in the wind, I would not chance putting a rotor up there. If it's not, you might want to attach it at the eave/roof line, whereupon it
may hold up to the weight and mass of the rotor. The Yagi you're contemplating isn't too big of a deal wind load-wise...but hanging that hunk of rotor up there on something that already moves around in the wind...I would not chance it. If it's only secured down low, you get into some pretty nasty moment arms between there and the top. Photos would help; click the reply button to get the advanced tools. Look for the little paperclip at the top of the text window, right next to the smiley button. Click it and follow the prompts to upload your pictures.
Don't get me wrong, I'm not trying to discourage you...but there's a right way and a wrong way to accomplish what you're trying to do, and the wrong way could result in damage to your house, which we all want to avoid if possible. And if the mast -- and what's mounted on it -- wasn't installed properly in the first place, you may get into claim issues on your homeowner's insurance if it does fall and damage the roof, a window, siding/fascia, or whatever. That's a headache nobody needs.:wink: