Lucency is a technical term for an area that lets x-rays through tissue and appears darker on the picture. Peri-screw lucency is a result of having had a peri-screw insert â¦ ed into the bone, possibly due to an accident.1 person found this useful. They're is a contraction or shortening of 'they are'.   . Their means belonging to people or things previously mentioned or  easily identified (Your parents do not look similar, except for  their noses).
Amplified antennas are best for the suburbs and rural areas, where a TV signal has to travel a greater distance. They also tend to perform better in rainy or stormy conditions, which can also affect how well a signal travels.
The gain of an antenna is the relative increase in radiation at the maximum point expressed as a value in decibels (dB) above a standard. The standard to which other antennas are compared is usually a Â½-wavelength dipole. The standard antenna is given a reference gain of 0dBD (zero decibel referenced to dipole).