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I agree with you , with the CS2V antenna on the roof top deck , and reception is not , obstructed , impeded , blocked , by the roof and building , reception of , WUTV FOX , WIVB CBS , WKBW ABC , should be no problem at all.
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A thought , if you have had cable tv service in the past , and you have cable delivered internet service , the cable delivered internet service must be on a Separate coax not connected to the antenna system and any other cable delivered service must be on a Separate coax not connected to the antenna system.
Also if you have had satellite delivered service , make sure all satellite system componets are removed and not connected to the antenna system.
Yes the coaxes that we're used for the cable system or satellite system can be used for the antenna system.
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Now return attention to the antenna system.
As a Test , try aiming the CS2V at about 180 degree magnetic compass direction , Yes I know the Tv stations are at about 166 degree magnetic compass direction. However sometimes reception will be better if the antenna is not aimed straight on at the Tv transmitter.
And as always , the antenna aim direction is adjusted for best reception.
As a Test , connect a continues length of coax from the antenna to 1 Tv.
Digital Broadcast Tv Tuners can develop - Digital Glitches - that are not cleared out with simple channel scans.
To clear tuner do Double Rescan.
http://www.wchstv.com/DoubleReScanAlert.pdf.
What is reception like now??
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Yes you can try the CM7778 preamp , it might help with the USA Tv stations.
But those local strong signal strength Canada Tv stations , the signal strengths might push the limit of the CM7778 preamp to handle strong signals.
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If still having reception situations/problems.
Install a bigger antenna.
And start the reception process with , no preamplifier , no power injector , no power supply.
To reach out for , WGRZ-DT Real UHF channel 33 , NBC , Antenna Tv.
And WBBZ-DT Real VHF channel 7 Tv , Me-Tv , Raycom Sports , This Tv.
Install a ,
http://www.antennacraft.net , HBU55 antenna , and aim the HBU55 at a starting antenna aim direction of about 170 degree magnetic compass direction.
Can also test reception with the HBU55 antenna with a continues length of coax connected directly to 1 TV.
And can also do the Double Rescan.
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Here are some places to buy antennas and etc. .
http://www.saveandreplay.com.
http://www.trentondistributors.com.