@Sean
I sent you the below via email, adding it here so others can see it.
1) Check if you can tune to any frequency/channel outside tvh. Use w_scan, if you don't have it, install it "apt-get install w-scan"
Run this
sudo w_scan -f a -c US -X
If it didn't find any channel, then time to update the firmware + driver
2) Note: this will update all the dvb drivers, make sure you backup your system.
sudo apt-get install git-core libproc-processtable-perl patchutils libdigest-sha-perl build-essential git-core linux-headers-`uname -r`
git clone git://linuxtv.org/media_build.git
cd media_build/
./build
sudo make install
After this, the driver was asking for dvb-fe-xc5000c-4.1.30.7.fw
wget
http://www.kernellabs.com/firmware/xc5000/dvb-fe-xc5000c-4.1.30.7.fw
sudo cp dvb-fe-xc5000c-4.1.30.7.fw /lib/firmware
3) now try w_scan again, if it works , move to TVH and you should be able to lock on all the channels.