Broken coax near the base usually indicates a stress fracture. Likely caused when the cable was bent in cold weather. Definitely try another antenna before you do an un-needed repair on your radio. If that doesn’t work, try a different microphone. In the event that neither solution works, your radio may need repair. Also, check that SWR.
OK. Your match sounds good. Does the radio indicate that it is broadcasting at full rate, does the needle or leds show positive gain? Of course a good way to test this is with another radio or walkie talkie.
Kinda vague here Eric. Can you be more specific? What model of uniden and what manufacturer of antenna? And, what are you refering to when you broadcast at under 2? Meanwhile, check your mic connection and your antenna connection, also your power to the radio connection. Be sure your antenna cable is not pinched or cut. Is the antenna adjustable?
With the speaker side down, set the radio on a flat surface. Remove the microphone plug from the radio. Look at the socket the mike plug came out of. You will see a four pin connection. Look closely at the four pins. One of them has a small bump or notch near it. To the left of that notch is the ground pin. To the right of that notch is the receive pin. Above the ground pin is the mike pin. Above the receive pin is the transmit pin. With the radio turned on and the mike removed, take a small horseshoe shaped piece of wire and touch one end of it to the ground pin and the other end to the transmit pin. This will key the transmitter. If the needle on the meter does not move, you likely have a blown final. If the needle does move, you have a bad microphone or blown audio output IC.