Not to dispute W8RMH as the ST2 certainly has its proponents but it has also come into question for long-term durability in the elements. Some have made DIY upgrades to address this so you might want to do a search for those threads to be fully informed. Most have found that a key element to getting the ST2 to perform is height in the clear.
Check out the higher end Diamond discone for solid construction in an all-band base station antenna. Avoid the Radio Shack discone for the same reason. However, many really like the RS 20-176 (catalog number) for VHF-Hi and UHF. BTW, I found the ST2 on the RS website and had never seen that before.
Since I have the tri-band on my vehicle, I'm in total agreement with W8RMH about the best mobile for VHF-Hi and above. It works OK for VHF-Lo but I know from experience you really need a longer antenna for better performance (TWSS, too...LOL!!!!)