A professional installation??
A professional installer with no compass??
A compass at Walmart is very little money.
Yes using a signal strength meter is OK.
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Install the DB4e antenna above the high point of the roof (not down low on the roof next to the rain gutter) in such a manner that the roof and house are not blocking reception to the , south west , south , south east.
WNED is a strong signal , should be no reception problem , if the DB4e is installed above the high point of the roof.
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Is WBBZ being received??
http://en.wikipedia.org/wiki/WBBZ-TV
If not and you will like to receive it , then install the Winegard YA1713 VHF high band 7 thru 13 channels antenna above the high point of the roof.
Use a --> UVSJ <-- = UHF/VHF Separator/Joiner , to connect the DB4e and YA1713 together.
Type the letters --> uvsj <-- in the ,
http://www.solidsignal.com , search box.
Do Not use a reversed splitter to connect the DB4e and YA1713 together.
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As always , trees and tree leaves do a real fine job of reducing or blocking Digital Tv reception and so do buildings and other obstructions including your own house.
It is best to install the antennas at a location that has the least amount to no amount of obstructions of any type or kind in the directions of reception.
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Yes tweaking Tv antenna might improve reception of WNED.
Most Digital Tv's have a signal strength meter and some Digital Tv's also have a signal quality meter.