[Texasrocker]

Hello! Vintage style loop antennas are most probably still usable if the insulation on the wires are still intact between the many individual windings? Careful visual inspection will help to know if "bare wires" exist and are touching "shorting" the loop needed to acquire proper reception as originally designed. Loop antennas were originally wound by the mfgrs to "balance" the many different brands & models type sets produced to exactly-correct the antennas path into the radio receivers circuitry designed for many different particular designs. Also, make sure the "leads" from the antenna havent broken off due to flopping-around un-attached. A close visual-inspection will sometimes help!
As far as re-attaching loop antennas to orig locations, using clear-silicone ( such as clear GE silicone household adhesive avail in a hand-squeeze type tube), has worked well for me. No conductive loss at all! Any broken antenna leads ( if any) will need to be re-soldered back as necessary. As far as replacements if needed, check Antique Electronic Supply catalog. http://www.tubesandmore.com online They offer a new loop ant replacement ( much smaller in design than originals were) I have used several times before in the past. Good luck with your Philco!! Just bet your orig antenna is still usable if connected properly? Just a guess.