A multi-element antenna that is similar in concept to the Goubau antenna except that it has four separate radiating elements. The radiating elements have diameters of 0.234λ, 0.235λ, 0.228λ, 0.217λ. The elements maintain approximately 0.013λ spacing from each other. That is at the height of 0.041λ above a ground plane. Each element has a maximum standing- wave ratio (VSWR) of 1.1:1 over a frequency bandwidth ratio of approximately 1.11:1 and serves as the baseline antenna for this thesis. Further, it was investigated and verified to increase the bandwidth ratio by implementing a frequency-agile continuous tuning approach to each radiating element by loading the top plates of each element with a variable shunt capacitance lowering the operating frequency and increasing the bandwidth ratio of approximately 3.27:1 maintaining a VSWR of 2:1. The resulting frequency shift to the lowest possible frequency reduces the size of the elements to 0.077λ, 0.085λ, 0.067λ, and 0.059λ in diameter, therefore making these elements compact small antennas. It is found that the four radiating elements are unable to radiate simultaneously. The solution used in this thesis incorporates a 4-way switch to tune the antennas discretely and only allow one element to work at a time and further increasing the overall bandwidth ratio to 4.07:1. Further, a 1x4 frequency agile multi-element antenna array is design and tested. The measured half-power beamwidths (HPBW) are 90º, 64º, 54º, 32º from lowest to highest frequency elements with approximately 0.287λ element separation. However, due to issues of a leaky bias network for the low-frequency range, the simulated results show that 36º HPBW was maintained for all elements across the entire operational bandwidth.