With Mike Fitzpatrick's help, this time I was able to find the actual antenna of WMCB-LP, which shares 107.9 MHz with WLPV-LP. (For you share-time hand-off buffs, WLPV operates from midnight to noon and WMCB operates from noon to midnight.) The antenna is mounted on the side of Sandri Oil building on Cleveland Street.
Copyright 2008, Garrett Wollman. All rights reserved. Photograph taken 2008-07-12.