The short answer
Yes, it can. A TV aerial is held to the brickwork by a bracket and a pair of lashings, so each gust that catches the aerial head tugs at the stack beneath it. Sound brickwork takes that in its stride. Tired mortar does not, and the added leverage can loosen courses, open joints and let rain in around the fixings.
An aerial adds little weight, but it sits at the windiest point of the house and pulls on the same few bricks every day.
How an aerial loads the brickwork
The stack is a tall column of brick standing clear of the roof. An aerial is fixed to it with a bracket that is bolted into the masonry, plus lashings, which are galvanised wire straps wrapped round the shaft to stop the mast swaying. The mast and head then rise above the pot, and that extra height matters more than the weight.
How does wind reach the bricks?
Wind pushes on the head, the mast acts as a lever, and the bracket hands that push to the nearest few bricks. Gale after gale repeats it. Mortar in good condition spreads the force through the whole shaft. Mortar that has eroded cannot, and the bricks around the bracket become the first to shift.
An old, multi-element aerial on a tall mast is a bigger lever than a slim modern one, and it stays up long after anybody remembers who fitted it. The older the aerial, the less likely anyone has looked at the fixings since the day it went up, and rust can quietly eat through a strap that once held firm.
Signs the fixings are causing harm
Trouble begins at the bracket and the lashings, and much of it can be seen with your feet on the lawn and a pair of binoculars.
What should I look for?
Look at the joints around the bracket for open gaps, crumbs of mortar or a dark streak where water runs in. Watch the mast in a breeze: if it sways or leans, something has worked loose. Rust on the lashings, or lashings hanging slack, tells you the straps have stopped doing their job. A stack that no longer looks square against the roof ridge is a worse sign.
Grit and sand in the gutter below mean mortar is leaving the joints. Inside, a damp patch on the chimney breast or the ceiling beside it can be rain finding a way down from a cracked joint near the bracket.
If the stack has started to tilt, treat that as the bigger issue; a leaning chimney is covered on its own page.
Photograph the stack once now. Later pictures from the same spot show whether anything has moved, and they give a roofer something to compare when you ring.
Moving or removing the aerial
When an aerial is fixed to a chimney, taking it down is a job for a roofer. The lashings are drawn tight, the bracket is bolted in, and whoever does it stands on the very top of the roof with a long mast in hand.
Can the aerial live somewhere else?
Usually, yes. A pole fixed to a gable wall or the fascia board can carry it, or a loft aerial can pick up the signal in some homes. An aerial installer can advise on reception, and a new position takes the leverage off the chimney for good.
If the stack is being repaired, the aerial normally comes off first, since the bracket sits right where the repointing or rebuilding takes place. We take it down, repair the brick, and refit it on a sound part of the stack or leave it off if you plan to relocate it. The old bolt holes are filled so they cannot become a path for water.
Abandoned lashings left on the shaft hold damp against the brick. If the aerial has gone, ask for the wire and the bracket to go with it.
Mending the damage
Failed pointing around the bracket is usually put right by repointing: the loose mortar is raked out and fresh mortar packed into the joints. MyJobQuote gives a typical UK range of £450 to £1,200 for chimney repointing (MyJobQuote, Oct 2026). Height, access and the amount of mortar to be replaced decide where a stack falls in that range. The page on chimney repointing describes the work.
When does the stack need more than repointing?
If bricks beside the bracket have moved, or cracks run through the brick as well as the joints, filling the joints will not hold, and the top courses may need to come down and be laid again. If a gale has done the damage, chimney storm damage sets out what to do first.
Everything starts with the survey of the stack and the aerial together. You see photographs of the brickwork round the fixings, taken on your own roof, and then a single written price for the repair. If you want the aerial moved as well, say so before we start, so the order of work suits both. Browse our full chimney repairs service for the other jobs on a stack.
More on aerials and stacks
Should I fix a new aerial to my chimney?
It is better to avoid it. A stack with tired mortar makes a poor anchor for a mast, and every bolt or strap is a place for water to collect. A pole on a gable wall puts no load on the chimney. If you still want it there, have a roofer check the brickwork first.
Is a satellite dish different from a TV aerial?
A dish is heavier and catches more wind, so it puts more leverage on its fixings than a slim aerial does. The advice is the same: avoid fixing one to a chimney if you can, keep an eye on the joints beneath an existing one, and have it taken down by a roofer when the stack is repaired.
The full picture: Chimney repairs in Taunton · More short answers