I'm lacking signal at the end of the house from the Mweb router and while the range extender they supply is helping its not extending the signal enough. I called Mweb sales and they say I can't buy another range extender until the promotion is over, but they don't know when it will be over. I'm happy to buy another one - could I just get a zyxel repeater and use that, or are there any other options? Any suggestions?