Roy, W7EL wrote:
"Who cares that you have a 50 dB null in one particular very narrow
direction, if a few degrees away the response is 40 or 50 dB greater."

This is an example of Roy`s earlier post which noted differences between
amateur requirements and commercial requirements. Roy is right. There
are real differences.

Commercial licensees operate on assigned frequencies and enjoy some
protection from interference on their assignments. A broadcaster may as
a condition of his license be required to have a null in one or more
azimuths in his pattern to protect another broadcaster who was there
first. In this broadcaster`s case, he is interested in the narrow null
and may very well expect and hope his signal a few dgrees away is 40 or
50 dB greater.

Best regards, Richard Harrison, KB5WZI