A map for providing television antenna recommendations for a selected geographic area is disclosed. The map comprises multiple contours, a legend and a channel list. Each contour corresponds to a type of antenna. The legend associates each contour with a type of antenna. The channel list includes television channels that were used in generating the map contours. A preferred method for generating the maps of the present invention uses terrain data representing the topography of a geographic area. A set of television channels being broadcast in the geographic area is identified. A set of signal characteristics is calculated based on the identified set of television channels and the terrain data. The calculated signal characteristics include signal strength of at least one television channel at various points in the geographic area, and include multi-path characteristics and signal blockage characteristics. The preferred method generates a map of the geographic area, wherein the map includes multiple contours based on the calculated set of signal characteristics.

A map for providing television antenna recommendations for a selected geographic area is disclosed. The map comprises multiple contours, a legend and a channel list. Each contour corresponds to a type of antenna. The legend associates each contour with a type of antenna. The channel list includes television channels that were used in generating the map contours. A preferred method for generating the maps of the present invention uses terrain data representing the topography of a geographic area. A set of television channels being broadcast in the geographic area is identified. A set of signal characteristics is calculated based on the identified set of television channels and the terrain data. The calculated signal characteristics include signal strength of at least one television channel at various points in the geographic area, and include multi-path characteristics and signal blockage characteristics.

A calibration procedure of wireless networks to create a topology map mainly consists of two phases: a measurement phase during which each wireless device, i.e. all mobile terminals end the central controller, transmits a calibration signal in broadcast mode (S2, S3, S4) and each other wireless device measures the received signal quality and the reporting phase during which each mobile terminal reports the measured results to the central controller of the network (S6, S7). Both of these phases are preferably initiated by the central controller, the measurement phase with the broadcast of a measurement control signal to all mobile terminals (S1) and the reporting phase with the broadcast of a reporting control signal to all mobile terminals (S5). Based on all measurement results the central controller creates a topology map of the network once all reports have been received. This topology map is updated in two cases, namely when a new device joins the network with a high priority calibration and when a timer expires with a low priority calibration, i.e. only when there are enough free resources.

A retention mechanism is formed of a molded plastic member having a base portion with at least one through-hole and a first through-slot adjacent thereto. The plastic member includes a card receiving structure having an open side, and a second receiving structure having an open side with a second through-slot through a wall of the receiving structure perpendicular to the base portion. Inserted in the plastic member is an elongate metal member having a base portion and a distal end. The metal member extends through the first and second through-slots with the base portion positioned adjacent the base portion and the distal portion positioned within the second receiving structure. The distal portion of the metal member is formed to provide spring action against a member inserted into the second receiving structure.

Method for data transmission in a wireless local area network refers to wireless local area networks (WLAN) consisting of a multitude of transceivers capable of establishing communication with one another (i.e. operating in a peer-to-peer mode). Implies the determination of the quality of communication between all transceivers and storage of communication quality data by each of the transceivers. Based on stored data on communication quality, a transceiver operating in the transmission mode transmits information to an addressee by a transmission route that provides for the quality of communication, which is equal to or better than a specified threshold value of communication quality. Stored data are updated periodically. The method improves the quality and reliability of communication for WLAN users (including mobile users) thus increasing the data transmission rate.