Pointing An Antenna

Most people point their antenna by trial and error — using a compass then fine tuning by judging picture quality or watching a signal strength meter on a TV or DVR.  Some people invest in a signal strength meter.  I have a better way.

I use a Silicon Dust HD Homerun to point my antennas.  The HD Homerun has many advantages over much more expensive signal strength meters including…

  • inexpensive
  • easy to use
  • simultaneously monitoring two stations
  • dual use
  • better information

An HD Homerun is a dual tuner device that streams your antenna signal on your LAN.  The least expensive OTA HDHR available at this time is the HDHR Dual which retails for $129.99 and is currently selling for $79 on Amazon.com.

It’s very easy to use…

  1. Attach the HDHR to you LAN and antenna
  2. Install and run the HDHR app
  3. Open two instances of the HDHR Config Tool
    • Set each to a channel you want to analyze
  4. Adjust the antenna to achieve the highest possible Symbol Quality

Notice I said Symbol Quality.  The HDHR app reports signal strength, signal quality, and symbol quality.  Per Silicon Dust…

  • Signal Strength (ss) is the raw power level as measured by the receiver
  • Signal Quality (snq) is how clearly defined the digital data is
  • Symbol Quality (seq) is the amount of correct or corrected data over the last second

A less technical explanation where the concepts are explained in terms of the experience of listening to a radio…

  • Signal Strength represents the volume
  • Signal Quality represents how clearly you can hear the lyrics
  • Symbol Quality indicates the percentage of the lyrics you could hear or guess correctly

Signal Strength is somewhat irrelevant; if your antenna isn’t pointed properly, it doesn’t matter how loud you turn up the volume, the static will prevent you from hearing the lyrics correctly. Similarly, amplifying a weak HDTV signal can result in a high signal strength but too much noise to decode the digital data correctly.

Use the Signal Strength for a rough idea of direction, but align the antenna for the highest Symbol Quality, ignoring Signal Strength.

Let’s take a look at a real life example…

hdhrus

Here I show my TVFool report next to two instances of the HDHR Config Utility.  As I adjust the antenna to pull in WMUR, I can easily see the impact of the change on WBZ.

Once you have your antenna pointed, the HDHR is a great tool for understanding performance issues.  When I am having a bad reception day, I pop up the Config Utility to see what is going on.

Finally, the HDTV was not designed as an antenna pointer.  You can use it to watch broadcast television via a number of apps and servers.  To sum things up, everyone should have an HDHR on their network!

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By Len Mullen Posted in OTA, Tip

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