M0NWK has a great blog and on there, he talks about making an effective EMC/NOISE REDUCTION MAINS FILTER. It consists of a bit of mains cable and a ferrite ring (Fair-Rite type 31) which is easily obtainable in the UK for around £15.
It takes just a few minutes to put it together and it is quite effective. Inserting it into the mains feed of my shack has brought slightly lower levels of noise. It helps to stop common-mode currents from getting into the mains and also stops noise from the mains, so it could help you with both TX & RX issues.
I inserted mine just in front of a Mains Distribution block which feeds every component in the shack.
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