If the antenna supplied with the "3" model is the same as that on the "2" model, it isn't a bad antenna at all. I can certainly understand wanting to get more out of the radio though.
Something to try before buying another antenna is to just add a counterpoise to your existing one. You might be surprised at the difference in performance, I was. From my front porch, hitting the local repeater (about 5 miles away, hills etc.) was "iffy". After adding the 'tail', the counterpoise, it was a easy 'hit'.
That counterpoise, "tail", is just a length of wire about 19 inches long connected to the 'ground' terminal of the antenna. Unscrew the antenna, wrap the conductor around the 'threads' of the connector, screw that antenna back down. In effect, you now have a vertical 1/2 wave dipole. Well, on 2 meters, anyway. It seems to work well on 70 cm too.
Later, I found a skinny piece of metal that would 'fit' under the antenna to do the 'connecting' with, didn't break that wire quite as easily. Someone used to make a "tail" like this for HTs, wish I could find one...
- 'Doc