What is directional: Definition and 1 Discussions

Directional drilling (or slant drilling) is the practice of drilling non-vertical bores. It can be broken down into four main groups: oilfield directional drilling, utility installation directional drilling, directional boring (horizontal directional drilling - HDD), and surface in seam (SIS), which horizontally intersects a vertical bore target to extract coal bed methane.

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  1. Flyboy

    Compact highly directional medium wave antenna designs?

    I know that there are highly directional shortwave/HF and VHF antenna designs that can be made fairly compact, but is it possible to do the same for medium wave, i.e. below 3MHz? I can’t seem to find anything helpful online about any theory that would point to a shape, let alone an actual...
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