  Fast radio bursts (FRBs) are extragalactic astrophysical transients whose
brightness requires emitters that are highly energetic, yet compact enough to
produce the short, millisecond-duration bursts. FRBs have thus far been
detected between 300 MHz and 8 GHz, but lower-frequency emission has remained
elusive. A subset of FRBs is known to repeat, and one of those sources, FRB
20180916B, does so with a 16.3 day activity period. Using simultaneous Apertif
and LOFAR data, we show that FRB 20180916B emits down to 120 MHz, and that its
activity window is both narrower and earlier at higher frequencies. Binary wind
interaction models predict a narrower periodic activity window at lower
frequencies, which is the opposite of our observations. Our detections
establish that low-frequency FRB emission can escape the local medium. For
bursts of the same fluence, FRB 20180916B is more active below 200 MHz than at
1.4 GHz. Combining our results with previous upper-limits on the all-sky FRB
rate at 150 MHz, we find that there are 3-450 FRBs/sky/day above 50 Jy ms at
90% confidence. We are able to rule out the scenario in which companion winds
cause FRB periodicity. We also demonstrate that some FRBs live in clean
environments that do not absorb or scatter low-frequency radiation.
