For the 4m band (70 MHZ) i am using my FT847 or my SDR .

Antenna is a dual band antenna PA5070-7-3 with 4 elements on 4m.

Preamp is a TGN Twin 4&6 for 6m and 4m.

This is the dual band antenna PA5070-7-3 with 4 elements on 4m:

Have not yet investigated where all the noise comes from.

Very often (sporadic E) we have a lot of noise from all the Russian TVs around 70.107 - 70.118 MHZ.

See also The Four Metres Website.