It does a decent job compared to what?

Because you have no other antenna to compare it to - all you know is what you got locally with the rabbit ears...

Technicially it is not called SWR - sorry that is CB lingo - for the people who knows nothing and doesn't care to learn anything..

In communications we call it VSWR - since all we are concerned about is the VOLTAGE present.

power from a generator ( transceiver ) is measured in volts and amps which when multiplied together equals WATTS.

power from a antenna is measured in MICROWATTS....

How much of a standing wave are you going to generate with 10 microwatts?

Even still more - the SWR as you call it is not as important as the loss rate.

450 ohm ladder line could have a VSWR of 20:1 - yet have very little outcome on the performance of your antenna system - because the loss is very low in 100' @ 7 MHz.

Its only as we increase frequency that we concern ourselves more with loss.

140 something megacycles is not all that bad when it comes to line loss.
440 MHz on the other hand is a whole different story...

I would suggest that you do a little more internet research....