Some people use a DIY parabolic foil around a wifi dongle to get better signal from a weak public WiFi hotspot, and some people buy a wifi dongle with an antenna that looks like a long vertical stick. Would these tricks also increase upload speed even though the parabolic foil is only at the dongle side and not at the router side, or even though the vertical stick is only added to the dongle and no additional stick was added to the router aside from the two sticks that it usually have already?
Or is it the case that the router says "I cannot get good signal from you, Wifi dongle. You can hear me well, but I cannot hear you well. Your upload will go slow, dongle."