Yes, get those 10mm plugs with 8mm screws fitted properly and the wall will give way before the fixings. I vaguely recall A&TV having a bit where they tested the pullout strength by pulling a screw out of a wall with a car - I think it did eventually pull out, taking part of the brick with it.
Mum's has been up for a few years now with no problems - and as I say, a stonking great 6foot long Yagi on a tall pole. Did another for a friend, again another big Yagi on a tall pole. I made a point of mounting them a bit down the wall as, TBH, I was actually worried about the possibility of pulling the apex of the gable end off if mounted too high up. Dad was originally talking of putting it above the window before I suggested that the wall probably isn't all that strong there.
As it is, it's fairly easy to work on there, using "not too high" ladders, it's possible to slacken the bolts and slide the pole down until someone on the ground can take control of it and lower it all the way - that's how we put it up, stood on the ground, lifted it up vertical, put the V-bolts on slack to control it, then lifted it up, fixing the cable as we went. When I took these photos, I hadn't finished clipping the cable up - I didn't leave it like a washing line
EDIT - The aerial was originally on the chimney, but when the old one packed in it was just a right PITA to get to. I did get a quote from a local installer, but had no confidence he wouldn't fit another "bacofoil" job, or bodge it like the previous one which wasn't wired correctly and had a hole drilled in the terminal box to let water in
Don't forget that you can significantly reduce the loadings on the brackets by spacing them well apart - I believe the recommended minimum is 1/5 of the total pole length between the brackets. Further apart won't do any harm - but looks odd and means a longer pole.
There's always some debate, but IMO the K bracket goes at the bottom. The idea is that the K bracket takes all the weight, and so the pole needs to be very well clamped to it. The pole only needs to be clamped to the T bracket tight enough to stop it sliding around. I think A&TV have some images where the pole has folded over at the top bracket, possibly because it's been "nipped" a bit by an over-tight V bolt which will very significantly weaken the pole - and I've seen one or two for myself where this has happened.
And lastly, when I fitted both of them, I used copious amounts of sealant round the bolts and behind the brackets so no water can get into the bolt holes and freeze the render off. And does it need saying - only use hot dip galv brackets unless you want "coffee stains" down the wall
