KGO broadcasts a VHF signal. VHF, unlike UHF, can be trickier to receive, especially with indoor antennas. Dolores Park is surrounded by hills and buildings. These can obstruct or reflect the VHF signal, causing "coming and going."

Moving your antenna closer to a window or higher up could improve reception. Weather and atmospheric conditions can also sometimes affect signal strength. This is more common for VHF channels.