"Attic Loss" varies a LOT due to construction details and Roofing Materials (Metal is the WORST and Red Spanish Tile is also fairly high with wood shingles LOW....until it gets WET)....and whether signals are blocked by Aluminized Mylar "Thermal Wrap", Foil Backed Insulation or Chicken Wire in Stucco (popular in my location)....and BTW, shooting through END of the Attic may be LOWER Loss...esp. if remove Metal Mylar/Foil. OTOH, Windows can let signal leak in, where they are reflected around inside....unless they have a LowE Thermal [Metal] coating...which has about 20 dB Loss. Based on looking at MANY different OTA Tests over MANY years, on the average there is about 13 dB +/- 7 dB difference between Roof and Attic Mounted Antenna....which is a HUGE difference.
Last edited by holl_ands; Yesterday at 12:39 AM.