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  2. Television antenna - Wikipedia

    en.wikipedia.org/wiki/Television_antenna

    The oldest and most widely used (at least in the United States) indoor antenna is the rabbit ears or bunny ears, which are often provided with new television sets. [6] It is a simple half-wave dipole antenna used to receive the VHF television bands, consisting in the US of 54 to 88 MHz ( band I ) and 174 to 216 MHz ( band III ), with ...

  3. Indoor antenna - Wikipedia

    en.wikipedia.org/wiki/Indoor_antenna

    Being close to other electric or electronic equipment in the building, an indoor antenna is prone to picking up more electrical noise that may interfere with a clear (analog) reception. [2] Used for digital broadcast, the noise is less of a factor than analog broadcast, which recently makes this type of antenna a more popular solution.

  4. Free-space path loss - Wikipedia

    en.wikipedia.org/wiki/Free-space_path_loss

    In telecommunications, the free-space path loss (FSPL) (also known as free-space loss, FSL) is the attenuation of radio energy between the feedpoints of two antennas that results from the combination of the receiving antenna's capture area plus the obstacle-free, line-of-sight (LoS) path through free space (usually air). [1]

  5. Long-range Wi-Fi - Wikipedia

    en.wikipedia.org/wiki/Long-range_Wi-Fi

    A long-range seismic sensor network was used during the Andean Seismic Project in Peru. A multi-hop span with a total length of 320 kilometres (200 miles) was crossed with some segments around 30 to 50 kilometers (19 to 31 miles). The goal was to connect to outlying stations to UCLA in order to receive seismic data in real time. [2]

  6. Path loss - Wikipedia

    en.wikipedia.org/wiki/Path_loss

    Path loss normally includes propagation losses caused by the natural expansion of the radio wave front in free space (which usually takes the shape of an ever-increasing sphere), absorption losses (sometimes called penetration losses), when the signal passes through media not transparent to electromagnetic waves, diffraction losses when part of the radiowave front is obstructed by an opaque ...

  7. Link budget - Wikipedia

    en.wikipedia.org/wiki/Link_budget

    (dB) ≈ 36.6 dB + 20 log10[frequency (MHz)] + 20 log10[distance (miles)] These alternative forms can be derived by substituting wavelength with the ratio of propagation velocity ( c , approximately 3 × 10 8 m/s ) divided by frequency, and by inserting the proper conversion factors between km or miles and meters, and between MHz and (1/s).

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