I didn't know which unit
I didn't know which unit I needed, so I called the company and explained my setup, and they told me what I needed.
I am located in an area where I am on a network, but the signal is very weak. This unit makes a significant difference in signal strength. It boosted my signal from 1 bar to 3 or 4 bars 4G LTE, depending on how close I get my cell phone to the indoor antenna. However, if you are not on a network, you won't have internet access. It will only boost the cell signal.
I am very happy with this device and I would recommend it to others.