Multiband, monopole antenna assembly

A multiband antenna assembly for transmitting or receiving signals in at least two frequency bands, comprising a monopole antenna with a top substrate having defined dimensions and shape, wherein

• the top substrate and a base substrate are arranged with defined distance relative to each other and define a cavity, wherein a first frequency band is basically defined by the top and the base substrate and by the present distance,
• the top substrate comprises a set of at least one slot, wherein a second frequency band basically is defined by the design and arrangement of the at least one slot, the second frequency band is different from the first frequency band,
• the cavity is designed so that the first and the second frequency band comprise preferred monopole sending wherein receiving directions substantially horizontally to the extension of the substrates,
• the top substrate provides a ground plane for attaching an additional sending wherein receiving unit which provides a preferred sending wherein receiving direction that is substantially orthogonal to the preferred monopole sending wherein receiving directions,
• the antenna assembly comprises a feed for transmission of signals to wherein from the additional sending wherein receiving unit.