6-80 Meter S9v34
HF Base Fiberglass antenna


Add to Cart:
The S9v34 is a tough, yet ultra-lightweight vertical designed for Amateur Radio use. The S9 is a 43 foot wire element in a 34 foot mast, which offers a tough ultra-lightweight (3.5 lb) antenna that can be user configured in many ways (see pictures below). For example, it can be configured as, a) multi-band antenna from 160 through 6 meters by installing the 43 foot wire element in an L configuration off to the side of the 34 foot mast to an optional Alpha S9 Match placed a few feet from the antenna base, b) the 43 foot wire can also be trimmed to form a resonant base fed vertical for 40 meters and the third harmonic of 15 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 S9v34 can be mounted on the ground or on your roof.

•Permanent ground-mount installations require a 40-inch long, 1-1/4 (1-5/8 OD Max) galvanized steel pipe. The S9v34 base tube simply slips over the pipe for a simple and elegant deployment. (A mechanical connection from the antenna base tube to the pipe is neither required nor desired.)

•Because the S9v34 is so light, you can roof-mount the antenna using a simple 3' tripod
normally used for TV antennas. In this configuration, the S9v34 functions as a ground plane (GP) antenna and four, wavelength radials are required for each band of operation.

When used with a good RF ground, the S9v34 is a serious 40 meter DX antenna. The natural resonant frequency of the antenna is on the 40 meter band - and it is extremely broad banded. Depending on your ground system and proximity to nearby objects, the S9v34 will exhibit an SWR well below 2:1 on 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. There are several commercially-available 1:1 choke baluns available (Balun Designs, etc. are some suppliers to consider) or you can create a simple choke balun using your coax feed line.

Internal rig tuners will easily tune the S9v34 anywhere on 40 meters. But if you want to use the S9v34 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, a 4:1 Unun is recommended at the antenna feedpoint for coax runs over 50 feet long. A 4:1 unun lowers the higher impedances presented by the antenna on frequencies above 40 meters.

If you are using a quality antenna tuner and have a coax run under 50 feet, a 1:1 current choke balun located outside of the radial field will suffice.

Finally, in lieu of an antenna tuner in your shack, you can use a weatherproofed, remote antenna tuner at the S9v34 feed point for absolute lowest loss and best over-all multi-band performance. There are several remote antenna tuners on the market. When a remote tuner is used at the antenna feedpoint, a 4:1 unun is not required. However, a 1:1 current choke balun may be needed between your transmitter and the antenna (outside of the radial field) if you experience RF current in your shack. (Burying your coax cable also helps minimize RF current from flowing back into your shack.)

For optimum performance, a ground-mounted S9v34 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 S9RP Aluminum Radial Plate to connect and organize your ground radials.

Loading coils to extend the range of the antenna can be built by the user. The 80M coil is 15 turns of #12 AWG insulated wire on a 3" PVC coupler.
Copyright © 2017 S9 Antennas.