As a retired architect, I should perhaps mention some problems anyone 
will have with any type of radio reception inside a building.

Wood construction is best for reception, but there are things included 
in the average wood frame house that will block reception, such as old 
fashion metal plumbing lines, and metal heating and air conditioning 
ducts. Stay clear of bathrooms, and keep them out of your line of sight, 
if you live in an older house.  Toilets and tubs of better quality are 
steel, with enamal coatings.

Some older houses, the better built ones, have plaster walls and 
ceilings instead of drywall, these may offer some reduction, but if you 
happen to have an older house where plaster was applied to metal lath, 
then you might as well give up and buy some wire.  Also, most older 
stucco houses used metal lath, so this would reduced radio reception 
coming through their exterior walls.

Finally, if you are in a stell framed building, the steel beams and 
columns will play hell with reception. Most well built commercial 
buildings are steel frame or reinforced concrete, which is just as bad 
as steel.

And don't forget that some houses have metal roofs.

Neal Hammon  Ky Architectual registration 345.
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