Hmm, yeah so basically it disrupts the signal when a lightning bolt hits near by. But seriously, I might try it but, it has to be a very close lightning bolt.
I don't think it really disrupts the signal, the lightning does not reach that high in the frequencies, plus the FM being inherently strong against disturbance (the in-band disturbance would have to be higher than signal-10dB in order to cause just marginal effect).
But it may quite easily overload the radio input stage by its strong out-of-band energy (many FM sets are designed really poorly when it comes to robustness against strong interferers in the 1..30MHz range overloading the input), so the radio becomes "deaf" for some time (for the disturbance duration, so some 10's us, enough to cause a hearable crack).
The most common error is the antenna input being just capacitively coupled to the input transistor, so more than ~30mV on any out of band frequency causes first many stations becoming mirrored across the whole FM dial range and then with higher voltages the normal stations disappear.
Adding a band-pass (the simple double LC available in the form of a thick film compact filter
like GFWB3, aka one parallel LC as a shunt plus one series LC as a series element towards the amplifier) may seem as some extra losses with no apparent selectivity benefit, but its main role is just preventing the input stage overload by all the out of the FM band mess the antenna may pick up.
Some radios are better with this, some are worse (it uses to be the weakest point of the many modern DSP-chip based designs - the digital filtering may seem to do miracles, but an overloaded input mixer is just in no way to be recovered by the processing "magic" afterwards), it could even be one badly designed receiver converting the low frequency high power signals into the FM band and disturbing all reception around.
A real experience with a HAM supposedly disturbing the TV reception (keying a SW transmitter caused severe TV distortion all around, but all the transmitting equipment was tested and found perfectly OK):
The culprit was found to be a clamp of pair of antiparallel diodes in one TV-set (some block away from the transmitter), which acted as a frequency multiplier, so absorbed some 3.5/7M/14Hz from the HAM transmission coming via the TV antenna coax (outer coax surface acting as a "long wire" SW antenna, carrying that current into the TVs) and radiated it as a disturbance in the VHF TV band; first clipping those diodes off fixed all the disturbance problems (before that he ensured with the TV service documentation the front end is robust enough against damage just by itself).