It's easy to do. Mine is sort-of like this, but I used baking cooling racks as a reflector. It doesn't look fancy, but it's up in the attic, so who cares. You just gotta know which direction to aim it.
I pulled out a 30 year old commercial double bow tie and it works great. I was going to parallel a second one (has to be done properly), but turns out there is no need, signal is extremely strong (OTA HD).