This will give you the proper electrical length for a 1/4 wave antenna usable for FM. 468 / frequency will give you length in feet and inches described as a whole number and a decimal.

Better yet, for home or mobile use, I recommend the 5/8-wave magnetic-mount 'Railscan' antenna from (about $90) or other sources. You will notice a vast improvement in reception of weak or distant signals. Follow the instructions to adjust length for best performance on the railroad band (160 to 162 MHz).The Yagi-Uda antenna has one driven element, one reflector one side and one or more directors on the other s The yagi antenna is a directional antenna with multiple elements placed one after another. Amateur radio / Antenna / Seven element yagi antenna. Wide band models for land and marine use. For T-tops, radar arches, speedboats, yachts and commercial vessels. If you put 4 watts into a 3-foot antenna you will get the same power out as if you wre putting about 1.5 watts into a 102-inch whip.įor T-tops, speedboats and sailboats. CB Antenna Length How does an antenna size affect my CB radio? If you put 4 watts into a four-foot antenna, you will get the same power out of that antenna as if you were putting 2 watts into a 102-inch whip. These cables provide a much lower loss factor than standard interconnect cables, and they can be used when the antenna must be placed at any distance from the radio device.

Low-loss and ultra-low-loss cable Cisco offers two styles of cables for use with the 2.4-GHz and 5-GHz product lines. Typical length on all antennas is 36 inches.The images above show how to use the jig to measure the length. You need four shorter pieces that are 71mm in length for the ground reflector and one 86mm piece for the radiating antenna part. Take the 2mm diameter brass pipe and use the jig to mark the cutting length.No ground plane or counterpoise is needed. These antennas can be mounted horizontally, vertically or as a sloper. The coax connector is at one end of the dipole, where it is most needed.

The Par End-Fedz are a full length half wave dipoles, but with an important difference. Most TV antennas include a length of coaxial cable to connect the antenna to the TV. You may need to occasionally reposition the antenna or find an additional means of securing it. Some indoor antennas employ suction cups so they can be adhered to windows, but these don’t always work as well as users hoped. In general, all the spacings, lengths, diamters (including the boom diameter) are design variables and can be continuously optimized to alter performance. The above table gives a good starting point to estimate the required length of the antenna (the boom length), and a set of lengths and spacings that achieves the specified gain.

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