How does the radiation pattern of a horizontally polarized antenna vary with increasing height above ground?
The takeoff angle of the lowest elevation lobe increases
The takeoff angle of the lowest elevation lobe decreases✓Bonne réponse
The horizontal beamwidth increases
The horizontal beamwidth decreases
Explication
Raising a horizontal antenna increases its spacing from the reflecting ground measured in wavelengths, which moves the first interference maximum closer to the horizon. The lowest elevation lobe therefore comes down as the antenna goes up, which is why height helps for DX.