Abstract :
The ¿batwing,¿ which forms the radiating element of the R.C.A. Superturnstile aerial, can be used to take the place of wide-band dipoles in certain other aerial designs. The paper describes briefly some examples for both horizontally and vertically polarized transmissions; unlike the Superturnstile they are suitable for masts of thickness comparable with a wavelength. The immediate application is to television broadcasting in the United Kingdom in both Band I (41¿68 Mc/s) and Band III (174¿216 Mc/s). Another feature of new designs of transmitting aerial is the use of a split system having separately fed halves to avoid the need for a reserve aerial.
