How much signal does an attic cost you?
Antennas Direct says you can lose up to 40 to 50% of your signal's strength through roofing materials, and that most antennas' effective range drops by 10 to 15 miles in an attic (Antennas Direct). Its support team puts it at "at least a 50% reduction" (Antennas Direct Support).
That makes the attic a good fit when your stations are close and a poor one when they're near the edge of range. Check the distances on your city page: if the stations you want are within a short drive, an attic often works. If some are far away, plan for an outdoor antenna.
What blocks the signal in an attic?
- Metal roofs: Antennas Direct says an attic install under a metal roof is very difficult.
- Foil radiant barriers: metal or aluminum-backed insulation will most likely block the signal (Antennas Direct FAQs). Antennas Direct's attic guide says "solar shield" barriers would need to be replaced.
- Solar panels: Solid Signal says a tin roof or solar panels in the path can cost almost all of the signal (Solid Signal).
- Ductwork and wiring: Antennas Direct says 6 feet or more of distance from them is ideal.
Where should the antenna go in the attic?
Put it as high as you can, on the side of the house that faces the towers, and aim it toward them. Your city page shows the compass direction. Keep it clear of metal ducts, wiring and anything foil-faced. Then scan for channels, adjust a little and scan again until you find the best spot.
Do you need an amplifier with an attic antenna?
Sometimes. If the stations you want are farther away, or the cable runs a long way to your TVs, a preamplifier can make up some of the loss. Antennas Direct says antenna-mounted preamplifiers are always preferred over ones placed near the TV. Don't add one if your signals are already strong, because too much gain can overload the tuner (Channel Master).
Does an attic antenna need grounding?
Outdoor antennas and masts must be grounded under Article 810 of the National Electrical Code, with an antenna discharge unit on the lead-in cable (EC&M). The sources we checked don't say how those rules apply to an antenna inside an attic, so check your local code or ask an electrician.
Why choose an attic over the roof?
Mostly for looks. Antennas Direct notes that many people choose the attic for appearance even though FCC rules give them the right to put an antenna outside. If you live with an HOA or rent, our guide to antenna rules for renters and HOAs explains what those rules cover.