This invention is transmission line of system one kind of uniform electric field, is corner of connection plural number prop in a rectangular upper-frame, as soon as various props bottom end meets firmly extends the foundation, connects the side bar group which respectively in the fore-mentioned upper-frame's short side department above the one, under the side bar links up, each under side bar is the contact in a common ground plate, turns round under the fore-mentioned rectangular upper-frame radiation of board on a suspension engagement fore-mentioned side bar, as soon as, second the relative broadside departments this radiation board extend respectively are auxiliary the side bar, enhances the radiation board high/to enable electric field of the establishment widely to be evener.