There is a company, Valcom, in Guelph, Ontario Canada that is
advertising in the US radio magazines that they are selling MW band
antennas as short as 15 meters

I believe WGCH in Greenwich, CT is planning to use one as they are being
evicted from their quarterwave site.

The Valcom is not the only short MW antenna, wasn't there an AARP (wrong but
similar acronym) type that looled like a fence?