What happens to the radiation pattern of an unterminated long wire antenna as the wire length is increased?
Fewer lobes form with the major lobes increasing closer to broadside to the wire
Additional lobes form with major lobes increasingly aligned with the axis of the antenna✓Bonne réponse
The elevation angle increases, and the front-to-rear ratio decreases
The elevation angle increases, while the front-to-rear ratio is unaffected
Explication
As an unterminated wire is made longer in wavelengths, its standing-wave current distribution breaks into more half-wave sections and the pattern splits into a growing number of lobes. The major lobes swing progressively away from broadside and closer to the axis of the wire itself.