# Antenna input power

I have internet dongle huawei e3131. It has external antenna connector. I made at home some type of parabolic antenna. Picture for illustrative purposes (without foil) :)

Basically it put foil inside my fruit dish and put my e3131 in center with usb extension cable.
When dongle was directly attached to laptop, it shows signal strength 1 bars of 4. When i put dongle in my 'super antenna', then it shows 4 bars of 4. I then looked at statistics of network. It was about -90dBi with dish. Today i searched ebay for antenna to my dongle. For almost all antennas in description was Max Input power(W): 60. (Example here on ebay) I know that usb cannot give that much power. What means that Max Input power? Does really theses antennas works?