I assisted a acquaintance living in a second story apartment in a week reception area and limited to an indoor antenna. I tried several desktop amplified/non-amplified loop and rabbit ear models. None could receive all available stations unless amplified and re-positioned in accordance with the TV station location. The amplified models also had tuning controls that also might require adjustment
I got the best results with a desktop log periodic antenna similar to this one.
While it worked well alone it worked better with an inline amplifier. Note that it also needed re-positioning in accordance with the broadcast station but there was no additional fine tuning required.