I was wondering if an antenna could pick up some sort of signal if it was exposed to a spray of electrons or ions. For instance I have a patch antenna calibrated for 300 MHz. The patch antenna was placed in an environment where it could be getting sprayed by a wave of electrons followed by a wave of ions. In the antenna response I see a very strong signal voltage drop follow by a strong spike that is temporally correlated with when it would be getting sprayed, but the frequency of this signal is orders of magnitude below 300 MHz. Is this a possible effect of the particle spray, or is it more likely that something else is the cause of this low frequency signal showing up on a high frequency antenna. Any help would be GREATLY appreciated!