I use Google maps on satellite view to determine a distant landmark (like a tree in neighbor's yard) that is true north of my antennas and then eye sight that along the antenna boom. Kevin N4UFO

-----Oh... hang on, this may be an important point I've been missing all this time, but this means one must determine the magnetic declination for their QTH? Up to this point I had been just aiming my yagi via compass and leaving it at that.

Sorry to hijack the thread here, but if this is the case, then the difference between magnetic and true north will be very different depending on your location.