Channel Master CM-4228HD versus the Winegard HD-8800
In both cases the models tested are the "new HD" version being shipped post-DTV cutover  They were ordered in October of 2009.

Channels 15, 20, and 24:


Channels 23, and 26:

(Note: Channels 24 and 30 are approximately 75 degrees off axis.  The visible signal is an indication of side lobe response only.)

Channels 30 and 33:


Channels 44, 47, 49, and 51:


Conclusion
The Channel Master CM-4228 has as much as 4 dB better sensitivity than the HD-8800.  Only at the highest channels measured does the HD-8800 show a slight (1 dB) advantage.

For fringe area scenarios, the CM-4228 seem preferable.