Wow, thanks for the input.
I'm hoping the upgrade will result in more reliability in heavy weather as opposed to better picture as there are a couple of US stations that I receive at 1-2 "bars" of "signal strength" on my TV. I'm hoping I can stop those stations from being dropped in heavy weather.
As far as installing the antenna, my plan is to: 1) initially install it without angling the bays toward each other and just rotate the flat antenna on its rooftop mast until I get the best signal strength and then 2) angle the 2 bays toward each other to see if signal strength improves.