Antennas for FM Tuners in Urban Setting

When is the approx. distance from the transmitter(s) to your residence?

The ST-2 is omnidirectional. With a directional you have to point it towards the station you want. IMO, a directional is so much better!
http://www.magnumdynalab.com/st-2-omnidirectional-fm-antenna/

   I have four McIntosh tuners..they all perform great with a ST-1

Finding a good antenna involves trial-and-error.  Many overlooked antennas outperform their counterparts.  Many factors are more important than the antenna: station proximity, your building, what is in your building ... .  Many times an inexpensive properly placed antenna outperforms an expensive poorly placed antenna.  

As the son of a TV serviceman (anyone remember those guys?) and antenna installer, I recall him teaching me there are three primary criteria with antennas for TV and FM.

One was pointing towards the  source of the broadcast antennas. These were directional antenna that typically have 3-5 arms making them more capable of receiving weaker signals and provides a stronger output to your tuner. An electric rotator can better point to a variety of broadcast sources. As many have stated, omnidirectional antenna receive signals equally from all directions but are usually a single whip metal rod yielding a weaker signal. 

Two was that TV signals were primarily "line-of-sight" or straight line signals making antenna height directly related to distance from the signal--further away means mount it higher. Some were even mounted on home towers 75-100 feet tall. 

Three is outside mounting is MUCH better than inside. Walls and roofs block signals and weaken their strength.

Hopefully this helps you decide which to choose for your situation and narrow the trial and error process.. Generally, if you're within 50-75 miles of the FM broadcast antennas you want to listen to, you'll likely find many options.