A transmitter/receiver for use in a dielectric logging tool. The transmitter/receiver generally includes a housing, a septum, a first antenna, and a second antenna. When operated as a transmitter, a first and second electromagnetic signal are emitted by the first and second antenna, respectively. The housing and septum are shaped to combine the first and second electromagnetic signals into a combined signal having varying orientations depending on the phase difference between the first and second electromagnetic signals. When operated as a receiver, an incoming electromagnetic signal is divided into a first and second component signal. The first and second component signals are directed to the first and second antennas, respectively, where they are converted into first and second electrical signals. The first and second electrical signals can then be combined, by adding or subtracting the signals for example, to produce a resultant electrical signal corresponding to incoming electromagnetic signals having different orientations.