The 5g frequency band, the c-band which these 5g bands operate in. the radar altimeter is an extremely important device. it is used by pilots to get precise data on the relative height of the aircraft to the ground as it gets closer to the ground. particularly crucial in the midst of a low visibility or zero visibility landi ing scenao so, if the radar altimeter is not operating well, you have a problem. now, the c-band 5g is supposed to be next door with a buffer zone from this band of frequency, but frequencies have a way of getting out of their lane so, it's important you have specific filt...