Any cell routers with external antennas?

I have had the gateway for over 6 months now. It worked great at first. We had 5 phones, 3 tvs, and 2 xboxs and we were getting 60-100mbps on downloads. Over the past month it has gotten so bad that now if we disconnect everything except 1 device, my phone can't load a webpage, my Xbox will get about 100kbps and tvs time out just trying to load the Netflix app. I have reset the box, I have moved it to every window in the house, nothing helps. I am about to just return it since regular service on my phone with a phone hotspot turned on is faster than the wifi. I'm done paying $50 a month for something that is slower than 1 bar of 4g on my phone. I was impressed at first but now I'm irritated.