Topband: Receive antenna pattern.

[Bruce]

Remember modeling only tells you what your receiving antenna pattern may look like.  With the help of a GPS and portable reviver with an S meter, you can get a better idea of what the pattern really is.  First put your coordinates  of your receive antenna into the GPS, Feed a small amount of power into your receive antenna. (not enough to damage the matching transformer) Then drive/walk around your antenna with the portable receiver/Mobil rig and take readings. (more distant readings are much more accurate) With your GPS in the goto mode, and receive antenna coordinates you selected,  you can collect signal strength readings.  A modern GPS will give you the direction back to your QTH/receive antenna, and distance. Find the right roads/locations, to get your readings, and get busy. Try to take all the readings at the same distance/or interpolate. Take many different location readings to help weed out the error ones that come from signal obstructions.    

73
Bruce-K1FZ