Is there a "good" universal garage door remote?

We moved into a house without garage remotes. I bought a set at Lowes and although they work, it seems to depend on the moon phase and the tides on what days and how well it works. You can stand in the same place and it works some days, doesn't other days. I even get out of the car in case there's a faraday cage thing going on.

Is there a better brand or more powerful signal? I'm about to put a pull string 100' long at the end of my driveway and use that to open the door...