[MrFixr55]

Not going from any document, but my semi-educated guess is to connect the "Ant" terminal the "Loc" terminal as a substitute for the long wire antenna commonly used at the time with these radios. It sems that Philco used a technique common to some aftermarket "plug in" antenna gimmicks that purported to use the house wiring as an antenna. I remember seeing these even in the 60s and 70s in magazines for use as a substitute for TV antennas. Definitely use a Safety cap for #35 when restoring this set and consider placing on the transformer side of the switch. Note the absence of any EMI filter caps on the power line (See JR Bladse's 46-480 thread). Hopefully the local stations were stronger than the noise from the vacuum cleaner's brush type motor , arcing across high tension cable insulators duirng rain and any other electrical interference. This radio is ca 1927-1928 or so, and many electrical appliances were coming into vogue at the same time that radio was.

Hope this helps!