Topband: Which 4 directions?

[Dan Maguire via Topband]

Frank wrote:
>>> A 160 meter receiving 4-square can be built with verticals as short as 20 feet and can be built with 80 foot sides, or even smaller.

Azimuth and elevation patterns for a few typical arrays can be found in the last section on this page:

http://ac6la.com/aecollection6.html

At the bottom of that section you'll also find various reference links, including Frank's 2014 Contest Univesity presentation that Jim just mentioned.

Dan, AC6LA