Bonk, the Radio Shack sputnik cannot do low band VHF. It is a VHF-Hi to UHF-Hi and Lo.
If your area utilizes VHF low band (30-50Mhz.), this antenna may not work well in that band. As the ST2 does it all. My area of NY uses alot on low band with Fire Depts. So the ST2 has worked fine for me.