How far is the nearest cellular tower? Do you have line of sight to it?

I also live quite remotely but am able to get internet with an externally mounted Yagi antenna pointed toward the tower in the mountains several miles to the west. I think I paid less than $150 for the whole setup including modem. I've read that you can connect to towers up to 50 mi. away with the right setup.

Unfortunately, your MiFi doesn't come with an external antenna connector (afaik) or you'd be able to just get an antenna and play around with it.