Good place to start is Fred Hopengarten's Book , 2nd Edition, Published by ARRL. http://www.antennazoning.com/main/page_amateur_radio_antenna_zoning_book.html Bud W1NSK Antenna Zoning for the Radio A
More great advice. Fred has defended some hams with VERY difficult problems with neighbors. FAR better to avoid problems than to fight them. K5RC spent hundreds of thousands of dollars fighting neigh