Your Netgem device is capable of receiving over 135 Freeview Channels with 15 channels in HD. However, the exact number of channels available to you is dependent upon location, tall buildings, trees and hills. To get an accurate indication of how many channels you can get, it is best to use the Freeview Checker developed by Freeview themselves.
You can also strengthen the number of channels available to you by installing a rooftop aerial. We recommend the below aerial, available here: