Antenna and Dipole antenna

Antenna noun - One of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste.

Dipole antenna and antenna are semantically related. In some cases you can replace phrase "Dipole antenna" with "Antenna", this terms are similar.

Dipole antenna noun - An aerial half a wavelength long consisting of two rods connected to a transmission line at the center.

Antenna and dipole antenna are semantically related. You can use "Antenna" instead a noun phrase "Dipole antenna".