<prompt> Qedela umusho olandelayo:  <response>: ngesikhathi sesimo esiphuthumayo 1948-1960, kwakugxilwe kakhulu ekunikezeni ukuxhumana kwamaphoyisa nempi. Lokhu kwakuhlanganisa ukufakwa kweziteshi zomsakazo ehlathini kanye nomsakazo wezingcingo onemvamisa ephakeme kakhulu VHF kunethiwekhi evamile yombuso. Ngo-1953, zonke iziteshi zokumisa izintaba ezidingekayo kunethiwekhi yamaphoyisa ye-VHF zase ziphelile, okwenza isiteshi samaphoyisa ngasinye nemoto yamaphoyisa zikwazi ukuxhumana nendlunkulu kanye nomunye nomunye. Izinsizakalo zemisakazo yamaphoyisa kwakucatshangwa ukuthi ziwuhlelo olukhulu kunawo wonke olwalukhona emhlabeni. 