Which of the following describes an extended double Zepp antenna?

An extended double Zepp is a specialized wire antenna that consists of two 0.625-wavelength elements placed end-to-end and fed in the center. This makes the total overall length exactly 1.25 wavelengths. The 1.25-wavelength dimension is mathematically significant because it is the maximum length a center-fed straight wire can be before its broadside radiation pattern splits into multiple smaller lobes. This gives the extended double Zepp the highest broadside gain (approximately 3 dB) possible for a simple straight wire dipole. Although the standard 'Zepp' is end-fed, the 'double' configuration operates symmetrically and is center-fed, which easily distinguishes it from the end-fed distractors.