S9V31 Antenna 40 - 6 Meters Self Supporting & Telescoping 31'

LIMITED TIME OFFER...The S9V antennas will include a rebate form for a FREE LDG 4:1 or 1:1 Balun or 4:1 Unun. It is the last page of the included manual, you simply tear it out, fill it out and mail it in!!!!

A Piece of Feedback Received from One of our Customers: Just a note to let you know I have the first s9 v31 I bought from you installed with 32 - 27' radials, s9 radial plate and 4:1 UnUn and have worked T32C on Christmas Island on 18 of the available band slots in CW/RTTY and SSB. Also 3D2R on Rotuma Island (Fiji) last week on 12 and 10 CW. This antenna rocks!73, David, VA3MJR

The S9v 31' Mk II is a tough, yet ultra-lightweight vertical designed for Amateur Radio use from 40 through 6 meters.

The antenna is constructed of rugged tapered fiberglass, weighs just 4 pounds and is double insulated for the safety of your family and neighbors. The design features UV-resistant, high-tech polymer tube rings that quickly slide on and off the antenna, allowing lightning-fast "tool free" deployment of the antenna at home or in any field environment.

The S9v can be mounted on the ground or on your roof.

Because the S9v is so light, you can roof-mount the antenna using a simple 3' tripod normally used for TV antennas. In this configuration, the S9v functions as a ground plane (GP) antenna and four, ¼ wavelength radials are required for each band of operation.

When used with a good RF ground, the S9v is a serious 40 meter DX antenna. The natural resonant frequency of the antenna is just above the top of the 40 meter band - around 7.4 Mhz and it is extremely broad banded. Depending on your ground system and proximity to nearby objects, the S9v may exhibit an SWR well below 2:1 in the upper, SSB portion of the 40 meter band without an antenna tuner.

So, if you primarily operate SSB on 40, you may be able to use the S9v on 40 meters without an antenna tuner. In this configuration, the coax feed line can be directly connected to the antenna. Radials and a 1:1 current choke balun are recommended. Internal rig tuners will easily tune the S9v anywhere on 40 meters. But if you want to use the S9v as a multi-band antenna, you will need a quality antenna tuner in your shack or remotely located at the antenna feed point. (Internal rig tuners do not have adequate range to match the higher impedances presented by the antenna on bands above 40 meters.)

For multi-band use, we recommend the LDG Electronics series of auto tuners. LDG tuners easily handle the wide-range of impedances presented by the S9v over the higher HF frequencies.

For multi-band use, a 4:1 unun is recommended at the antenna feed point for coax runs over 50 feet long. A 4:1 unun lowers the higher impedances presented by the antenna on frequencies above 40 meters

For optimum performance, a ground-mounted S9v 31' should be used with at least 16 radials (32 preferred), with each radial at least 26 feet, 9 inches long (0.2 wavelength at 7 MHz). Actually, there is no precise formula to calculate ground-mounted radial length because everyone has different soil and soil tends to change the electrical length of the radials. However, a general rule of thumb for radials is: “longer” and “more” is better. If you have the time and resources, 32 or more radials each at least 26 feet, 9 inches in length (or longer) should be considered to ensure top performance. It is highly recommend that you use the optional S9 Radial Plate to connect and organize your ground radials.