Many types of buildings can block reception because of the materials used to construct your home/condo/apartment.
- Stucco and Concrete: Since metal mesh or metal rebar is used in these two construction types for an antenna to work effectively it must either be placed in a window facing the direction of the towers or a roof antenna is needed to get the antenna up and over the blockage. Metals act as a barrier that in essence cages the signals and bounces them around making it almost impossible for the signals to "land" on the antenna.
- Mobile homes/Aluminum Siding: Again metals reflect and bounce signals. A roof mounted antenna or indoor antenna on the window facing the towers is the only option for this type of home. VInyl siding is ok.
- Metal Roofs: The only option for homes with a metal roof is to mount the antenna up and over the roofline so that the signals are not bounced away from the antenna.
- Radiant Barriers, Foil lined conduits/ductwork, Foil Heat Shields, Solar Panels: All of these things will effectively block signals so if these are present in your attic a roof mounted antenna would be necessary.