Since the early 1970's I've had an old cast iron bell knocking around the farm. I bought it at a flea market for $30, and Monte dutifully made a post and set it up at the old farmhouse across the road. When we moved from that side over here, the bell went with us, but I'd never gotten around to re-planting it. So, it's been languishing in various corners of the farm, gathering cobwebs and providing wasp-houses. Finally, I decided it needed a permanent home.
Enter one bracket: (plus a husband willing to dig a hole, plant a post, and chainsaw-shape it to the requirements of the bell)
and one BIG BELL with fist-sized clapper (15-inch diameter at the bottom).
Add paint to spruce it up a bit; then mount it on the post...
And we have the best calling center one could imagine! Of course, it only does high speed interfarm, rather than internet. And it doesn't do email. Only Amail (auditory mail).