From Dave G3YMC

Bob ZL2CA says:

<It has been noted in ZL that noise blankers do not work so well on
<narrowband loop receiving antennas

I have never found a noise blanker on any amateur receiver which has the
slightest effect on the sort of noise we encounter on 136 or any of the LF
bands, and they only really seem to work on ignition type of noise such as
you might expect on VHF.  Some recent rigs may perform better, but in
reality the noise blanker on most rigs is wasted space and it is no great
loss if it works even less well with a narrow band antenna!

73s Dave G3YMC