A. You could install a second router, Tommy. I've written a comprehensive tip that will help you do just that. That will increase your connection when you're upstairs for sure.
It's not the only solution to this problem, though. In fact, there are several solutions that won't cost you a dime. I would recommend trying these before you go through the trouble and cost of setting up a second network.
You can even combine these tips to get the biggest boost to your signal. I'm sure you'll get a stronger, more stable Wi-Fi connection. We'll have your whole house connected in no time!
The easiest solution is to give your router more height. This is a good idea if you live in a one-story house, as well. Place it on top of a bookshelf, cabinet or dresser.