J-Pole antennas are an excellent choice as a low power amateur radio antenna. But the all copper J-pole antennas will work great with both low power and high power radios. In fact the 2 meter model will handle 250 watts or more of power. But the antennas really shine as lo power radio antennas for a couple of reasons.
The all copper J-Pole antennas have a very low noise floor. Since they are constructed out of 1/2 inch copper tubing, they have a greater surface area to radiate RF energy than a wire antenna. This makes the antenna extremely efficient for both receiving and transmitting. Low powered and handheld radios will benefit greatly from this increased efficiency.
The other reason these antennas work well with low power radios is their portability. The breakaway J-Pole antenna breaks down into two pieces less than 34 inches long. This makes it very easy to transport the antenna or to make it a part of your go kit. There is more information on connecting a portable radio to my antennas in the FAQ.
Since reliability, sensitivity, and portability are all hallmarks of a good low power amateur radio antenna, the J-Pole really is your best choice.