About: http://webisa.webdatacommons.org/393786254

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	signals (2-30 MHz) is particularly susceptible to atmospheric vagaries dependent on environmental conditions such as weather, sun spot activity, time of day, etc., as well as distance.
http://www.w3.org/ns/prov#wasQuotedFrom	patents.com