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For 100KHz any aerial you build is likely to be comparatively short in terms of wave length (100KHz = 3000m). Broadcast people would erect multiple masts over a huge site with 1000's of metres of wire strung between them to try and get some "top capacitance" which tunes the aerial to a lower frequency frequency then its physical dimensions. For shortwave, military types use a log aperiodic yagi, which is HUGE for your frequencies. Radio Amateurs use inductive base loading to tune their short whip aerials to the lower frequency bands (3.5/7 MHz). I would just build the biggest frame aerial you can and tune it as required.
Frank
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