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The ePvision web site says has , Sensitive Tuners , Sensitive Tuners that have good interference filters are good for reception.
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The signal strength of KREY-DT , Real VHF high band channel 13.
(Virt) virtual number (10.1) , CBS and MyNetwork.
Improves a Small amount at 40 feet above ground.
I recommend install the HBU44 antenna at about 20 feet above ground as a starting antenna height.
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Here are some above the roof antenna mounts.
http://www.ronard.com/909911.html. Install the 3 foot or 5 foot tripod antenna mount.
http://www.ronard.com/34424560.html. Install the , ronard(4560) , eave antenna mount.
http://www.ronard.com/ychim.html. Measure around the chimney and install a , ronard(2212) , ronard(2218) , ronard(2224) .