As
Whiskey3JMC points out above, many folks use the 162 MHz NOAA weather frequencies as standards to test the reception of their radios. Depending on your distance from their transmitter, you can generally get an idea of a "reference point" to use to check various antennas, etc. It a little hard to follow exactly the chain of events that occurred and in what order to your radio. I don't think you have much to lose, but I would attach an operational antenna to the radio, tune to the strongest known NOAA station in your area and wiggle the antenna around at the connection point to see if you momentarily get a signal back. Also, with the antenna attached, you could give the entire radio a couple of slightly more than "gentle" taps to see if you can get a signal.
If that works, you know you have some kind of intermittent problem, although that doesn't do you much good unless you or a friend has the electronics prowess to open the radio and make the repair. NOT RECOMMENDED unless you are an expert in such areas.
Unless something you do restores the radio to complete operational ability, it does sound very much like your radio will have to go back to Uniden for repair. If your radio is under warranty, and you are fortunate enough that the drop did not disfigure the radio, you might get it fixed for free. More likely, if there is water inside your radio or evidence of damage due to mishandling, you'll probably have to pay for the repair.
In any event, hope things work out for you. Keep us posted.