Detail of the aft VHF in-flight antenna (used to communicate with the command module). I have additional pictures of the forward VHF in-flight antenna.
As described by the Lunar Module News Reference,
The two VHF in-flight antennas are omni-directional, right-hand, circularly polarized antennas that operate at 259.7 and 296.8 mHz.
Picture 2 of 2.