The two meter antenna is tuned to 146MHZ (1.2:1 SWR or less at 146MHz), and the SWR is 1.4:1 or less throughout the entire 2 meter band. This antenna also works great as a dual band antenna. The antenna will tune up on 70cm for excellent dual band performance.
A quarter wave antenna is sometimes used because it's shorter than a full wave antenna.
A quarter wave works better than a random wave antenna because of harmonics, I think that's the right word. You get less SWR (google it) using a quarter wave than you would with a 3/16 or a 5/16 wave antenna.
THe feed line does not enter into the calculation if it is shielded wire or a balance line. If you just feed the antenna with a hunk of wire then all of the wire not becomes an antenna and all of your design and math goes out the window, but less of your signal goes out of your antenna.
An antenna is able to receive a signal of any frequency. But frequencies that are multibles of dividibles of the antenna length are recieved much more stronger than those that are at odds with the math.
A quarter wave works better than a random wave antenna because of harmonics, I think that's the right word. You get less SWR (google it) using a quarter wave than you would with a 3/16 or a 5/16 wave antenna.
THe feed line does not enter into the calculation if it is shielded wire or a balance line. If you just feed the antenna with a hunk of wire then all of the wire not becomes an antenna and all of your design and math goes out the window, but less of your signal goes out of your antenna.
An antenna is able to receive a signal of any frequency. But frequencies that are multibles of dividibles of the antenna length are recieved much more stronger than those that are at odds with the math.
![2 Meter Slot Antenna 2 Meter Slot Antenna](/uploads/1/3/6/8/136805739/388145760.jpg)
2 Meter Slot Cube Antenna
- The slot antenna, which has been developed for 1.3GHz by G3JVL, is an easy means of obtaining an omni- directional radiation pattern with horizontal polarization. The antenna has a gain which depends principally upon its length and is typically 5 to 9 dBi.
- 2 meters quad Antenna by IZ3AYQ The antenna can be tuned for 145 or 144 MHz, and used in vertical polarization (as in this picture) or in orizontal polarization. Move the aluminium tube left or right. The tube is insulated from the quad by two small plastic insulators. It is an indoor antenna or antenna for restricted space.