 The inverted @-@ L antenna is a monopole antenna bent over to run parallel to the ground plane . It has the advantage of compactness and a shorter length than the λ / 4 monopole , but the disadvantage of a very low impedance , typically just a few ohms . The inverted @-@ F antenna combines the advantages of both these antennae ; it has the compactness of the inverted @-@ L and the impedance matching capability of the F @-@ type . 
