PURPOSE: To realize excellent operation even in high frequency bands by dividing the element of the lowermost stage of an expansion rod antenna into two parts with an insulator between.

CONSTITUTION: The element 10a of the lowermost stage is divided into two parts 10a' and 10a", which are connected in one body with the insulator 11 between. This element 10a slides in and out of a metallic element 13. The internal conductor 17 of a coaxial cable inserted into the metallic element 13 is connected to the element 10a' electrically, and the external conductor 18 is connected to the element 10a". This external conductor 18 is connected to a metallic chassis 15 electrically through a contact spring and stopper 12. Therefore, there is no large electric capacity formed between the element 10a' and metallic element 13 in an in-use state, so excellent operation up to high frequency bands of VHF and UHF is realized. Thus, the excellent operation is performed even in high frequency bands.