Many apartment and condo dwellers find that cutting the cord can be a little tricky IF conditions are not just right for reception.
Building Material Blockage - Part 1: Stucco, concrete, metal awnings, fire escapes, and metal molding can impede reception, so an antenna would need to be in a window to have a chance with these conditions.
Building Material Blockage - Part 2: Many apartment or condo dwellers find that the higher their unit the better the reception. This is dependent on the signal strength in the area and the location of the unit in relation to the broadcast towers. For example, if the signals are transmitting to the south side of your location, but you only have a window that faces north, you may not get as many signals as you would with a southern window placement.
The signals are weakened because they must travel through the building materials to get to the antenna and often will not be obtainable. In some apartment/condo’s customers get many channels in one side of the unit and little to no channels on the other side. When possible, plac the antenna in a window that is facing the direction of the towers for optimal reception.
This theory is true with any location where you use an antenna. We have some customers that receive tons of channels with an indoor antenna on one side of their home but only a few using the exact same antenna on the opposite side of their home. When there isn't a clear line of sight to the towers and the signals have to work their way through building materials, it can be very difficult to have perfect reception success.