Fox Hunt V7

(1 customer review)


When your closing in on the fox you may find the signals to be strong enough you can no longer find a peak or null with your antenna. Sometimes the signal is so strong that the RF will leak straight into the radio, connections and other equipment making the antenna useless. The solution is to use an offset attenuator. The circuit consists of a small RF generator, in this case 4MHz, which will mix with the incoming fox signal (such as 146.52MHz) and produce new signals at plus and minus the fox signal (142.52Mhz and 150.52Mhz). A potentiometer on the board changes the injection level of the RF generator which in turn attenuates the incoming mixed signal to your radio to a level where tracking can continue.


Our newest 4MHz offset attenuator in a new 3D printed PETG enclosure.  This latest version also includes our most recommended feature – a bypass switch built in!

  • Fully Assembled –  Just add a 9Vbattery, connect your antenna & radio and hunt away!

  • KIT – All the SMD components are soldered on.  Just complete the remaining thru-hole components.

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***NEW VIDEOSoldering BNC connectors on 

Click here for more information on fox hunting and the offset attenuator.

Add a tape measure beam and you have a great club kit build project!

There is a treasure trove of information with more tips, making fox boxes, and other events at

Manual: Fox Hunt Offset Attenuator V7 Manual

STL and FreeCad Files for alternate bracket mounts including 3/4″PVC (1″OD) and Arrow antenna booms:


Example typical attenuation levels:

  Frequency Attenuation
Attenuator ON,No offset 146.520MHz (Fox Frequency) 8-18dB
-/+4MHz Offset 142.520MHz or 150.520MHz 30-60dB
138.520MHz or 154.520MHz 35-70dB
-/+12MHz Offset 134.520MHz or 158.520MHz 60-80dB
Attenuator ON,No offset 450.000MHz (Fox Frequency) 6dB
-/+4MHz Offset 446.000MHz / 454.000MHz 35dB-70dB
-/+8MHz Offset 442.000MHz / 458.000MHz >-80dB
-/+12MHz Offset 438.000MHZ / 462.000MHz Not Measurable


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Additional information

Weight 6 oz
Dimensions 4 × 4 × 2 in

Kit, Assembled




Black, Gray, Red

1 review for Fox Hunt V7

  1. nathanprince121 (verified owner)

    Amazing product. This kit comes super well designed and packaged. I wanted a configuration that wasn’t currently in stock, so I emailed KC9ON and he sorted it out. Board, components and 3D printed parts were all high quality. It was super easy to put together and works just as expected. Turn it on, tune radio to 4MHz above signal and turn dial to the level of attenuation wanted. Perfect.

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