Hi,
We have a little chalet in Ramsau, Styria about 1200m ASL. For similar reasons as you mentionend I bought a commercial antenna instead of making my own.
Windspeeds can be way above 100km/h, and snow in winter is ample. So, I agree with you that going on the safe side is a good idea.
In my case its a Diamond CP6S shortwave & 6m antenna ranging from 80meters to 60MHz. When you look at the construction, I would say that making all this yourself (including the radials)
wont be a lot cheaper than buying one (a few hundred €). The CP6S has a max. wind speed of 180km/h (hope that never happens, I dont know what the rest of my house has).
I used about 15m of H2010 cable from the antenna (mounted on the rooftop of a new (tin) roof) to the shack.
Before hooking it up to the rig (Icom IC-7300), I measured it with an Anritsu MS2036A and found that the VSWR specs were OK. The only downside is the very narrow bandwidth at 80m,
but the manual mentions this before and you can change radials if you dont like the 80m center frequency.
If you can afford R&S gear the petty cash for the antenna wont be a problem
Regards, 73
Wolfgang DL1DWG