Attics Are Not a reception friendly environment and Never Will be a reception friendly environment.
Attics are a - close in - reception situation with many reflected signals - multipath - that will be the cause of bad reception or no reception of some channels.
Also signal attenuation and signal blockage.
Yes it is true that reception can happen with no problems , however that Does Not mean that attics are a reception friendly environment.
I recommend install the antenna above the roof in such a manner that the roof or house is not blocking reception to the , north east.
Here is the Federal Antenna Law that says Yes you can , install , use , maintain , antennas above the roof.
http://www.fcc.gov/mb/facts/otard.html.
Here is some information about WMKE. Looks like is transmitting Analog Tv transmission , not digital.
http://en.wikipedia.org/wiki/WMKE-CA.
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I recommend do a Double Rescan. Digital tuners can develop - Digital Glitches - that are not cleared out with a simple rescan.
http://www.dtv.gov/rescan.html.
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As always , trees and tree leaves do a real fine job of , reflecting , reducing or blocking Tv reception and so buildings and other obstructions including your own house.