SIGMAã Verticals
These are new Force 12, Inc. designs to provide high performance verticals on the HF bands. SIGMA's are true vertical dipoles, so they do not need radials and the real estate requirement is minimal. These antennas are the product of more than 4 years of research and development to provide the best vertical antennas in the world. The development includes testing of many types, such as empirical to validate the computer model, comparative tests with several other antennas, competitive testing ("Team Vertical", which set World and Continental records) and DXpeditions. These efforts have re-written the book on verticals and vertical antenna performance. More detail on the development of the verticals is available on this web site and others written by Kenny Silverman, K2KW (team leader of Team Vertical).
SIGMA verticals are not only built for amateur purposes, but for commercial as well. They can be supplied in survival ratings up to 200 mph. Other models are lightweight and small for DXpedition and portable.
The SIGMA series is the last word in verticals.
SIGMA-5 for 20-17-15-12-10 (9' tall, 7 pounds).
SIGMA 40 for 40 Meters (24' tall, free standing).
SIGMA 80 for 80/75 Meters (36' tall, guyed once).