How to Stack VHF & HF Antennas

Written by david lipscomb Google
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How to Stack VHF & HF Antennas
Diplexers are the devices normally used to stack VHF and HF signals. (Aerial splitter 4 sockets made of metal isolated on white image by Olga Sapegina from

Signal combining, known as "stacking," is the process of taking two or more signal leads and combining their outputs. The process is very common during satellite television installations where it's also desirable to connect an over-the-air antenna. Diplexers are the devices most commonly tasked with the duty of stacking VHF and high frequency (HF) signals. The result is that all devices' outputs are consolidated for use with a single tuner or receiver.

Skill level:

Things you need

  • 2 diplexers
  • 3 coaxial cables

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  1. 1

    Locate the incoming coaxial feeds from the individual antennas. The feeds typically come in through the basement, or lowest level in the structure.

  2. 2

    Screw the free ends of the individual leads into the "IN" coaxial legs on the diplexer. Screw one end of a single coaxial cable to the "OUT" leg of the diplexer; it doesn't matter which end since coaxial cable is bidirectional. Route the cable to the tuner as needed.

  3. 3

    Screw either end of a single coaxial cable to a second diplexer's "IN" leg, if the tuner or receiver has individual coaxial input terminals for separate sources. Screw either end of two short coaxial cables from the second diplexer to the individual inputs as needed. Otherwise, simply connect the single cable routed from the first diplexer to the appropriate coaxial input on the receiving device.

Tips and warnings

  • Ensure that the diplexers in use have identical output voltages at the terminals. This is marked on the label above the output legs on the device.

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