Probably, yes, they are below the threshold.
You may get more info in your area's Local HDTV Reception section of this forum. This sub-forum has a list:http://www.avsforum.com/avs-vb/forumdisplay.php?f=45
However, it appears from TV Queries that I did at:http://www.fcc.gov/mb/video/tvq.html
the digital channels you are trying to get have low power (ERP), except WTVY. Here is what I found for the ones you mentioned:
WCOV - 16 - Operating at 1.1 kW ERP (Construction permit...