Antenna Engineering - Antenna Engineering specialise in producing a range of high quality aluminium HF verticals ranging from mono band single element verticals to multi element phased arrays.

    Comtek Systems - very popular hybrid phased array systems.

  Spiderbeam - professional telescopic fibreglass poles.  Used in the construction of 4-squares by G4ATA and GW4RIB.

  DXEngineering - 4-Square Arrays

Of course, DX Engineering don't just build excellent 4-Square phasing systems.  They can supply everything from tools and materials to books and everything inbetween........ just click on the link and see for yourself.