In the US there are thin cheap gable mounts that are only good for small light weight TV antennas and attach to the facia and also larger but still flimsy brackets that mount to the wall and protrude a little past the roof overhang. I prefer to make my own wall mounts from 1/8 inch or 3/16 inch thick steel strap about 2 inches wide heating and bending it into shape. These are much stronger than most commercially available wall mounts.
Another possibility is using Unistrut and attach a horizontal length high on the facia and another a few feet below, then use Unistrut conduit clamps or U bolts to fix the mast to the Unistrut. Unistrut is very strong and will resist bending or flexing. You can use longer sections of Unistrut mounted down lower on the facia so you have a wider horizontal run to put up two or three masts with several feet of spacing between them.
Coax is up to you and for short runs I like LMR-240 which only requires a hole around 1/4 inch. You need to find out where the studs in the wall are located and where you want the coax to end up. Lately I just use a simple hole through the outside and inside wall drilled at a slight upward angle from the outside in. You then run the coax down the outside wall to the side of the hole and slightly below so it can make a loop and go upwards into the hole so water will drip off the loop and not run into the hole. There are various sealants available that can waterproof the hole and you can pull a little cable out of the hole, goop it with sealant then stick it back in pulling sealant into the hole.
This is just to generate some ideas as there are many more details in actually doing all this.
Hi, in the UK looking for recommendations on how to fix a couple of antennae (most airband and UHF receive) to gable wall of new house.
What mounts are best for gable wall?
What coax for external run?
Where to run coax through?
How to shield holes in wall from draft/weather?
Can you get mounts to support a number of antennas or should there be a pole per antenna?
Sorry if dumb questions but usually things have just been stuck in attic.
