My 2 cents..
The rubber duck antennas that come with handheld radios are the worst possible radiators. There are after market HT antennas that are only slightly better than terrible.
Depending on where you live, you'll want to get an antenna outside. If you're in a house, get it on the roof. If you're going to use the thing in the car, pick up a mobile antenna that mounts outside the car. Doing this will proved 1000% better results than buying another ducky.
The radio has four bands. Which bands do you intend to use? (You may need 220 or 50 Mhz. It depends if you have repeaters for these in your area).