There is a way to increase the signal, but you have to take the unit apart. Check out this link: http://www.pointlisse.com/PMA430/
Now select OTHER at the top of the page. Go to the sixth link " How to Enhance the WiFi Range and Reception of the PMA (2 comments) " . This has detailed instructions on extending the WiFi range. After I read it, basically you must double the length of the wifi antenna inside the PMA430.
I am trying to get a HAWKING HWUG1 usb to wifi to work. Still talking to Hawking Tech. support. I really don't want to open the PMA430 unit. If this works I won't have to.
Its on this site: http://www.pointlisse.com/PMA430/