About: http://webisa.webdatacommons.org/437735378

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	It is NOT spacing between edge to edge-but rather center to center.Also the 1/4 wavelength is a guideline not a hard and fast rule that it either works or does not on either side of that.
http://www.w3.org/ns/prov#wasQuotedFrom	prosoundweb.com