resonance frequency

[Benedict.Smith]

Hello, 
i am trying to understand the functionality of B- and E-field antennas, but there is one thing that i dont understand.
Why do the magnetic antennas that are presented in the project description have a resonance frequency? The loops behave like  inductors, but there are no capacitors, so there shouldnt be a resonant circuit?
Greetings,
Julian

Julian,
Any circuit will have capacitance, the wires from the coil and the PCB tracks for instance, these are kept as low as possible so that the resonance is higher than the frequencies we are interested in (we are looking at a range of frequencies so don't want the loops to show any resonance in this range)
Ben.