Design & Specifications

Design Philosophy

The I-10K design was a result of four years of research and developemnt, as well as suggestions we have received from Radio Enthusiasts. The antenna is built under five principles:

1- The I-10K is bullet-proof so that it will not be damaged by the high winds we have here in the Southern California Mojave Desert. It is better to use high quality materials and pay a little more than to have to replace the antenna every other year or so.

2- The antenna design should allow full output power to be used, with a margin of safety, so that the antenna will not be damaged from high power use.

3- Lightning Protection: make the antenna at DC Ground potential, for all metal parts.

4- The Impedance Matching System allows the user to adjust the antenna for minimum Standing Wave Ratio (SWR), while the length of the antenna elements is set for the proper lengths for the operating frequency, to produce the best field strength signal levels.

5- Use Ground Plane Radials, de-coupling the RF Energy from the coax outer shield for lower elevation angles and better field strengths, and also resulting in lower interference to neighborhood consumer electronics.

The I-10K is made from high quality Aircraft Grade Aluminum Tubing (6063 T-8) with aluminum tubing placed inside the antennas at the mechanical stress points. The Patent Pending Impedance Matching Circuit, allows a 1:1 SWR at the chosen operating frequency, between 24 MHz and 44 MHz. The Patent Pending Impedance Matching Device is very efficient, allowing more signal energy to be transmitted and received. Testing has proven that it causes significantly stronger signal field strengths compared to other 10 Meter and VHF Low Band commercial antennas. In fact, I-10K users report 1 to 2 full S-Units stronger receive and transmit field strength signal levels compared to the non-ground plane vertical type antennas. Most users report a significant reduction or elimination of interference to consumer electronics as compared to the noted antennas. But be advised, since each radio and consumer electronics installation is different, reducing interference can not be guaranteed.

I-10K Specifications:

Frequency coverage: Adjusted to operate within the noted bandwidth from 24 to 44 MHz

The I-10K can be adjusted to operate within 1.3 to 1.4 MHz bandwidth of the noted frequencies, at the 2.0 to 2.0 SWR curve points, using a LMR-400 coax, or equivalent, RG213, 9913, etc.

A Top Hat assembly significantly reduces atmospheric noise.

Power Handling Capability: 10 KW

Gain: 3.4dBi
Note: The I-10K has a measured field strength, that is 3 to 4 dB more field strength, than other vertical antennas with a advertised gain or 5.2 and 6.2 dBi. The I-10K consistently has a stronger Field Strength of 1 to 2 full S-Units as compared to the fiberglass type antennas.

Height: 247" at 28.5 MHz, height will vary with frequency.
Width: 195" at 28.5 MHz, width will vary with frequency.
Weight: 14 Lb. (approx.)

Mast Diameter sizes: 1 to 2 inches OD, (Outside Diameter)

RF Connector: SO-239, larger lower loss RF connectors can be installed, for larger lower loss coaxes, such as 7/8" heliax, for long lengths of coax. See accessories, below.


Aluminum Tubing is 6063 T-8, aircraft grade, heat treated high strength. The base assembly is made from a 4" x 12" x 1/4" piece of 6061 T6 aluminum bar stock that has two stainless steel 2" U-bolts and Saddles. Simply bullet proof materials!

Hose Clamps are Stainless Steel, Marine Grade High Torque, Mfg. By Breeze. Mast Mounting U-Bolts are made from 18-8 Stainless Steel. All hardware is Stainless Steel Hardware.


1- Larger RF Connector, for uses that may need to use longer lengths of coax, to reduce transmission line losses, and increase power handling capability. Larger coax connectors can be installed or simply replaced, by replacing the SO-239 bracket with a slightly larger bracket with the connector of the users choice.

2- Additional insulator / cover is recommended for uses above 10KW power levels.

3- Additional internal reinforcement aluminum tubing is installed for Extreme / Severe Weather Service (E/S-WS) applications, such as mountain top installations at repeater sites. The standard I-10K will survive 100 MPH+ winds.