SIGMAã Verticals
These are new Force 12, Inc. designs to provide high performance verticals on the HF bands. Sigma© verticals 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.
One recent e-mail from a Sigma-5 owner:
----- Original Message ----- From: Randy To: Kenny K2KW Sent: Monday, November 11, 2002 10:33 AM Subject: Feedback on K2KW.com
Well, I just looked at the website for the trip and I'm sorry that I couldn't join you on the 6Y expedition. Hope you put the Belize trip together and that I'll be able to do that in February.
As a testimony to the power vertical antennas, I just reached the 100 countries mark with my Force 12 Sigma 5. I started late in May and was gone most of October, AND I operate kinda intermittently. Final handicap, I have a large hill immediately behind me the virtually precludes communication directly North, like over the pole. There is a 90 degree quadrant with zero contacts.
Good news! I do have a long slope about 1 mile down to the Pacific and that accounts for the 599's I get in ZL land. Last week I worked a VU (first one I ever heard) on 20 M SSB long path. Got a 58!
Bottom line, you may include any of the above comments as testimonials for efficacy of your vertical antennas.
VERTICALS RULE!
Randy Johnson W6SJ
The Sigma© series is the last word in verticals.
SIGMA-6M for 6 Meters (6' tall, 4 pounds).
SIGMA-5 for 20-17-15-12-10 Meters (9' tall + base, 7 pounds).
SIGMA-SV5 & SIGMA-GT5 for 20-17-15-12-10 Meters (11' 11" tall).
SIGMA-20 for 20 Meters (16' tall, 12 pounds).
SIGMA-40XK Manual Band Change for 40-20-17-15-12-10 Meters (15' 6" tall + base).
SIGMA 40 (24' tall, free standing) and SIGMA 40XP (16' tall) for 40 Meters.
SIGMA 80 for 80/75 Meters (36' tall, guyed once).