Actually you cover the whole band with two off the shelf double ridge horn antennas, one covers 100 MHz to 1 GHz and the second covers 400 MHz to 6 GHz. The 400 MHz to 6 GHz antenna is fairly portable, less than 20 inches (50 cm) in any dimension. I strongly prefer horn antennas for experimental work for safety as they have a strong and obvious directionality. Discone and related designs such as Bicones have a doughnut mode (no directionality in one plane) and log periodic antennas can have unexpected spikes in their response and they get pretty big below 1 GHz.
Unless you are trying for communications out of slot canyon, bouncing for distance or legacy analog why would I care about anything below 1 GHz.
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Actually you cover the whole band with two off the shelf double ridge horn antennas, one covers 100 MHz to 1 GHz and the second covers 400 MHz to 6 GHz. The 400 MHz to 6 GHz antenna is fairly portable, less than 20 inches (50 cm) in any dimension. I strongly prefer horn antennas for experimental work for safety as they have a strong and obvious directionality. Discone and related designs such as Bicones have a doughnut mode (no directionality in one plane) and log periodic antennas can have unexpected spikes in their response and they get pretty big below 1 GHz. Unless you are trying for communications out of slot canyon, bouncing for distance or legacy analog why would I care about anything below 1 GHz.