Please remember RF is nothing more than a radio frequency - it is analog by definition. However, RF signals carry encoded information, which can be Digital (ATSC) or Analog (NCTS). The 8-VSB/OTA module in your VOOM box is only capable of tuning Digital TV (DTV) signals. Since almost all broadcasters are transmitting both analog and digital signals, your antenna may be picking up a fair amount of interference from as far away as 100 miles. IMO, short of purchasing an RF spectrum analyzer or a decent RF signal level meter, the best way to research RF in your area is to:
1. Plot your location (latitude and longitude) at the following site:
http://www.geocode.com/modules.php?name=TestDrive_Eagle
Example:
Lat: 37.253327
Lon: -078.594939 (your longitude will be expressed as a negative number)
2. Conduct a Broadcast DTV search based on your location:
http://www.2150.com/broadcast/ - cut and paste your Lat/Lon from the above link (note: delete trailing spaces when pasting).
- Input range of 100 miles
- Sort by channel
- Select the "List Analog Stations" option
3. You will then need to sort through the list in order to validate potential DTV stations in your area. There may be a number of low-power stations and you may discover that an analog station 70 miles away may interfere with one of your local DTV stations. In my case, DC is basically 50 miles to my north and Richmond VA is 50 miles to my south. The Richmond analog 35 is interfering with my reception of DC digital 35.
4. You can further validate stations of interest at the FCC website:
http://www.fcc.gov/mb/video/tvq.html
I hope this helps...