amkahal wroteany cheap access point will do the work, put it in station mode (client mode), it will receive from the modem and route internet to the dongle by cable.
I just asked for an access point they told me it acts as a repeater, it powers up the original signal !
I will google this, if you have any documentation or cheap models I will be appreciated if you share them,
btw, you can buy dongle from any satellite shop , you know it opens the scrambled channels by using the internet. Hope this helps,