But 100 yards is well inside the maximum length of an Ethernet cable so one long cable to a WAP or a "ROUTER AS A WAP" will fix this for cheap. A better solution is an optical run since it's immune to lighting strikes.
Now that you know consumer gear is a dead end, you can research commercial solutions.
You'll have to have a good network person in your employ to finish this off.
I was wondering what is the best way to boost a wifi signal. I have a small business located 100 yds. from my home and I'd like to share wifi. What is the best way/ equiptment to do this?