Methods for localizing markers within a body

A method for localizing a marker within a body, the method comprising:

• placing a distal end of a probe against tissue, the probe comprising an antenna assembly adjacent the distal end comprising:
• a plurality of antenna elements;
• and
• a base comprising nonconductive material, an exterior of the base forming:
• a planar distal surface placed adjacent the tissue, and
• a plurality of proximal surfaces extending from a peak to the planar distal surface at an acute angle relative to a longitudinal axis of the probe, such that the base defines a pyramidal shape,
• wherein the antenna elements are positioned on each proximal surface, such that the proximal surfaces of the base provide a support for the antenna elements at the acute angle;
• transmitting, by one or more transmit antenna elements on one or more of the proximal surfaces, transmit signals into the body;
• receiving, by one or more receive antenna elements on one or more of the proximal surfaces, receive signals that are reflected from the marker;
• and
• identifying or localizing the marker based at least in part on the receive signals.