Current how it works.

[LarryFine]

But how a dipole antenna work then?

New answer: Like a high-impedance voltmeter that reads (near) line voltage on an isolated wire.

 

[BarryO]

But how a dipole antenna work then?

For non-DC current you need to take circuit elements with reactive impedance into account, including the μ₀ and ε₀ of free space.

 

[Deltaforce]

For non-DC current you need to take circuit elements with reactive impedance into account, including the μ₀ and ε₀ of free space.

The point, a circuit need not physically closed for a current to flow