The MW band extension to 1700 kilocycles was done in the late 80s/early 90s.
Not all that many stations have moved there....besides you would only have room between 1600 and 1700 for maybe two stations
The warped (IMHO) reason for that extension was not to place new stations, but to move existing very low power stations to the new part of the dial where they could broadcast with higher power (10,000 watts daytime; 1,000 watts nighttime) and using a non-directional antenna.
The licence for the "old" station would be turned in after 5 years of the new "expanded band" station going on the air and would be deleted permanently.
Unfortunately things have changed.
Waivers have been granted and now in New York City we have a station on AM 1660 (WWRU) that broadcasts with 10,000 watts daytime and night-time and uses a directional antenna at night.
The stations may also be sold separately, which means the "old" station that would have been deleted continues to stay on the air in addition to the new station on the "expanded band".
Also, you may see some cheap radios where the dial goes up to 1700khz but the tuner mechanism is such bad quality that the radio may not tune up that high, or if it does it will start drifting off station. Had that problem with a small Philips pocket radio I bought brand new a couple of years ago.
The space between 1600 and 1700 is THE WORST place for an AM station to be.
[This message has been edited by SvenNYC (edited 01-31-2003).]