The simplest answer is that the "ideal" height for an antenna at these frequencies is 1/2 wavelength - but even there "ideal" depends on whether you want optimum ground reflection. If you can't get your 3.5MHz antenna 140 feet in the air, though, then "as high as you can" is the ideal height.19 nov 2013
How tall is the DX commander antenna?
The 15m band is also catered for by means of resonating the 40m antenna and uses what we have called a “boomerang” foldback to achieve a pseudo 5/8ths for 15m band.
Antennas can be classified in various ways. ... The dipole, monopole, array and large loop antenna types below typically function as resonant antennas; waves of current and voltage bounce back and forth between the ends, creating standing waves along the elements. Aperture antennas can be resonant or not.
What are the types of antennas used in wireless communication?
3.3. Types of Antennas. There are three main antenna categories available for wireless LANs: Omnidirectional, Semidirectional and Highly directional. Omnidirectional - Omnidirectional antennas are designed to radiate a signal in all directions.
They are used in almost all the electronic devices for civil, military and medical applications. Antennas are used for both sending and receiving radio transmissions. Technologies such as radio and TV, mobile phones and Wi-Fi, connected cars, global positioning systems (GPS), space communications, radars etc.
What is MF HF antenna?
Medium and high frequency (MF/HF) ELNA MF/HF antennas cover the frequency range of 0.1 to 30 MHz. This frequency band is highly popular among radio amateurs around the world. It exhibits very high ranges while through reflection (or: bending) at the ionosphere, even over-ranges are possible (“over-the-horizon”).
Why is an antenna tuner required for MF HF transmissions?
7-12B2: Why is an antenna tuner required for MF-HF transmissions? ... The longer antenna tuner calculates the proper spectrum band for the operator to use. To ensure transmissions are restricted to legal marine frequencies.
What type of antenna is use by VHF transceiver on board ship?
VHF ANTENNAS As the wavelength in the maritime VHF band (154-162 MHz) is around 2 metres, it is possible to use 1 and 1 wavelength antennas. The most basic design is the dipole, which consists of a split 1-wavelength element connected at the centre to a balanced feeder cable.