Thanks to Alexandru Csete at :"http://www.oz9aec.net/index.php/gnu-radio/grc-examples" I now have a working receiver. You can tune from 50MHz to 2.4GHz without the slider going berzerk :) I took the NBFM receiver that Alexandru wrote and modified it to make a simple that just displays the spectrum. The next task will be to make it scan. For now here is the GRC flow graph ...