A deployable ultra-wideband, Tightly Coupled Dipole Array, with Integrated Balun (TCDA-IB) is presented for CubeSat-based Ice Sounding Radar. A swarm of Low-Earth Orbit (LEO) CubeSats employing TCDA-IB can form the spaceborne sounding radar using synthetic aperture concepts. The proposed radar offers fine-resolution mapping of the polar icebergs at a reduced cost. In this perspective, we introduce packable linear sub-arrays that operate across 184 MHz to 735 MHz (4:1) with VSWR < 3. Two orthogonal linear arrays are folded across the four sides of a 12U CubeSat chassis. This array also introduces an extended bent ground plane that maintains a stable gain performance across the entire bandwidth. Finally, a novel tapered balun is realized to retain the TCDA bandwidth.