DIY FM dipole antenna or half wave antenna are the most used because is easy to build and cost a few bucks but has some drawbacks like little directionality, small gain. The rf dipole antenna is build ...

3. This is the horizontal (E field) radiation pattern of a half-wave dipole antenna. The antenna elements are located along the 270° to 90° line. 4. This is the vertical radiation pattern ...

such that the antenna comprises one entire wavelength. The main advantage of this arrangement is an improved bandwidth over a standard half-wave dipole. * for 75 ohm cable : Lb = La x 0.8 * for 50 ohm ...