47. I see in the directions for filling out a station log that is asks for
Alignment from True N : (deg; + is clockwise/east)
How do I get this information.  I am in Flemington, NJ and my coordinates are
40 30 6 N
74 54 4 W

Here is the value for your coordinates as computed at ....
http://www.ngdc.noaa.gov/seg/geomag/jsp/struts/calcDeclination
Declination = 12° 32' W changing by 0° 1' E/year

So if you put the antenna aligned to magnetic north then the log file should read -12.53 deg .  The best solution is when first putting up the antenna, to always align it with true north, that is, align it with magnetic north then turn it (at this location) 12.53 degrees clockwise.  However, it is best not to touch the antenna once it is set it place and collecting data.