А про вилку,скрепки,кнопки,лезвия и т.д и т.п, чем хуже,попробуйте---эффект не хуже,чем со свечой.А с парафиновой,не пробовали,лайков больше поставят.класс!
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You definitely need serious mental health treatment if you believe you'll get TV from around the world with this piece of recycled (to death) fundamental antenna design. It's really nothing more than an electrically short 3/4 or 5/8 wave monopole, using a foil covered CD as a 1/4 ground plane when vertical at UHF broadcast in the high UHF segment. So it really has zero advantage over a yagi in that configuration. Turned towards signal source, ie flipped horizontally or at an angle pointed towards a signal source, it starts to act as a waveguide and that's when it starts to develop gain in the direction of the helically loaded monopole section where the GP is both GP and reflector. In fact most of the waveguide effect comes from the fact coaxial cable is a waveguide anyway. It's worth nothing that since no dimensions are given, there's no mathematically sound reason given why it's at all resonant at the high UHF broadcast frequencies, it just happens to be a coincidence the about 30cm ruler is close to a half wave, electrically shortening it (but 'lengthening' in RF turns) by putting 4 turns of a helical winding brings what was about 30 cm of exposed coax core conductor into around a 3/4 or about 5/8th wave monopole at the high UHF frequencies used for terrestrial TV broadcast. So where you get any results will be limited to what's available on the TV transmitter or relay your tuning across the output from. Noting the demo was based on tuning into DVB-T2 output, ie mpeg4 TS transmitted content synthetically achieves the goal of looking like it's got a lot of gain, where the con of that is it'd be sh*t poor vs analogue transmissions unless you had a good LOS to the source transmitter since DVB-T and DVB-T2, being digital transmission requires quite a bit less received sig strength to achieve a clean reception at the relative distance from the Tx site. This is why, when TV transmission switched over the the DVB standards, they reduced the output of the Transmitters and relays considerably. Basically it could have been simplified to what's commonly a sleeve dipole or 'flowerpot' antenna just using coax and not using a foil covered CD/DVD as a GP as a sleeve dipole. Note also, if you turn a sleeve dipole made of coax, horizontal or at a canted angle to make it semi-directional, you get the same basic effect without the faffing about of tin foiling a disc. The fact coax is a waveguide means that any vertical antenna design fed with coax tends to have a directional emphasis when canted to point horizontally or angled towards a Sig source because most the the radiated pattern (relative to a Tx example) radiates from near and the end of the coax when you expose the inner by cutting back the dialectic solid or foam inner insulator back by a certain ratio and ditto another ratio shorter for the braid/screen and cut the outer rubber sleeve short of the exposed screen/braid. This tendency is because in an untampered with coax, the screen of the coax is the waveguide, the inner is the driven part and dialectic creates a finite stable insulator and by proportionally reducing the screen by shortening it, reducing the dialectic length to an intermediate length, the energy radiated spreads as opposed to being heavily centred down the length of the coax relative to intact coax. But remember that because it's one piece of coax, the overall length of the coax has an impact on the end result because being a WG in itself, it's the primary component in the resonant length of the overall sleeve dipole or GP added variant as shown in the video as a monopole with a disc GP. If you are close, relatively and have a good true LOS to the Tx site, just simply pointing the end of a coax cut to a reduced half wave (half the wavelength* velocity factor of the coax) will achieve much the same results. If you are close enough, a reduced quarter wave length will do the job. Where I used to live, back in the analogue days, we used to be able to get the local TV region transmission using just a quarter wave of welding rod or wire soldered to the centre pin of a belling-lee coax connector (the common coax connector that predates the F plug and SMA plug standards), and given we were only 4 miles from the Tx with true optical LOS, that still could overload the TV's receiver even with a mere quarter wave monopole poking out of the back of a belling-lee plug. If you're seriously interested in making a coaxial cable fabrication antenna with real tangible gain, and omnidirectional, try building a coaxial colinear using 8-16 coaxial element sections. Easy to find a online calculator for the working out. If you want to explore real gain on a waveguide antenna design, where upwards of 12dbd gain can be easily got, there are plenty of designs and calculators online focused on that aspect. Note that waveguides, whether just a coax or an engineered waveguide antenna are most effective in the direction of the axis of the driven part (inner core on coax) or the direction you point the waveguide antenna when you point it towards a LOS, or near LOS direction relative to Tx source.
