I have both the hr20-100 and 700 reievers. Can anyone comment on the OTA tuner sensitvity or if one works better than the other picking up a signal. I have a db8 antenna on my roof to pickup ota channels from canada using my hr20-100. Just wondering if the 700 model would be better. I did notice the 100 models only get signals by 5's. eg 35% m40% 50%. Where the 700 percentages vary. thanks