This interactive D3.js (v7) visualization maps the United States radio frequency spectrum across a horizontal, segmented color-coded band. It displays frequency allocations from VLF to SHF ranges, with each segment color-coded by service category such as Broadcasting, Aviation, or Government/Military. The interface offers a logarithmic scale toggle and a category filter dropdown. Hovering over any band triggers a dynamic tooltip showing the frequency range, service, and category. The underlying `frequencyData` array in `data.js` is rendered as SVG rectangles with `d3.select` and `d3.append`, supporting interactive exploration of spectrum allocation.