+=>
-----
Having the antenna in the window is what is driving the recommendation for the CM4228HD antenna.
The weak signal strengths of the UHF channels and 2 Edge Path obstructions in the direction of reception , other then KTIN PBS.
Calls for a big UHF channels 14 thru 51 antenna , the flat upright CM4228HD will fit better in the room and window , then a 10 foot or longer antenna.
The CM4228HD is designed to receive UHF channels 14 thru 51 and VHF channels 7 thru 13.
The VHF reception capability of the CM4228HD antenna has a small amount of signal gain.
So might be required to use a larger VHF high band channels 7 thru 13 antenna. A
http://www.antennacraft.net , Y10-7-13 VHF high band antenna.
-----------------------------------------------
If the CM4228HD receives KCAU channel 9 reliably in the window.
Then the CM4228HD antenna will most likely receive KCAU channel 9 even better on the roof.
If so then it is only one antenna on the roof , the CM4228HD antenna.
-----------------------------------------------
Yes use the , RCA TVPRAMP1R preamplifier , it has combined input for a single UHF/VHF antenna and can be connected separate UHF and VHF antenna inputs.
Do not use the CM7778 preamp.