did you read the info at the link ???
"About
“Lightning Antennas” was created in 2010 by the former lead manufacturing engineer at Signal Engineering, a Californian manufacturer of Quad Antennas for the Citizen Band for more than 15 years.
SE discontinued manufacturing antennas in 2009 and those 15 years of expertise are now being capitalized by “Lightning Antennas” which is poised to pair a proven successful technology, the Quad Antenna design, with a recognized, well-designed line of products that has been in use for several decades.
What’s Changed:
•We have streamlined our product line according to our experience and customer’s needs over the years; resulting in better production efficiency and reduction in cost for our customer. (See below for a cross-reference chart between SE antennas and Lightning Antennas).
•Improvements that have been made range from utilizing better materials, improved manufacturing processes, more concise literature, packaging, etc.
•With these improvements we are confident we offer the most advanced and mature line of CB antennas in the market!"
3's
(edit): they eliminated the Lightning 4 and offer The Lightning 4+ as the replacement.