radio antenna: omnidirectional antenna comprising the part of a radio receiver by means of which radio signals are received
omnidirectional antenna: an antenna that sends or receives signals equally in all directions
scallop: one of a series of rounded projections (or the notches between them) formed by curves along an edge (as the edge of a leaf or piece of cloth or the margin of a shell or a shriveled red blood cell observed in a hypertonic solution etc.)