A narrower bandwidth is indicative of a more efficient resonant antenna, and a broadband antenna will be less efficient. It is understandable why some operators prefer broadband antennas, which is simply because they are easier to use.
For example, when discussing a MagLoop with someone, you may hear; ‘Oh, a magnetic loop antenna is complicated!‘. This is often because (from a retailer’s aftermarket perspective) a broadband antenna is easier for their team to support. Fortunately, Alpha’s MagLoops are easy to setup and simple to tune. However, we ourselves at Alpha Antenna use & build Resonant and Broadband antennas, both of which are designed to meet certain operator expectations and operating objectives.
So, what’s an amateur ham radio operator to do?!
What Antennas Are Efficient?
Resonant antennas that need to be tuned when changing bands (frequencies) are typically more efficient.
Broadband antennas that do not need to be tuned when changing bands (frequencies) are typically less efficient.
Resonant HF Antennas
A dipole is used by industry as a ‘reference antenna’ to measure the efficiency of antenna systems. So, if you are looking for maximum efficiency in a portable antenna for VHF UHF and HF, consider the HexTenna by Alpha Antenna. This system can be deployed as either a dipole or vertical antenna. Alternatively, an OCF Dipole design like the portable Alpha MIL 2.0 or base HF ProMaster antennas can offer decent tuner free efficiency.
Broadband HF Antennas
One of our broadband systems is the EMCOMM antenna. This system is designed to enhance NVIS in support of local Emergency Communications requirements. This inherently also limits the likelihood of transmissions entering an adversary’s operating position at distances greater than 1,000 miles. However, DX can be experienced when the band conditions are open.
For immediate DX satisfaction from a more efficient tuner free system, we recommend using a larger design, which comes in a Portable or Base version. In both of these designs, you would need the Optional ‘NVIS Kit Four 35′ NVIS elements’ to achieve the same omni-directional patterns as the EMCOMM antenna.
What Should I Buy?
Really, there are only two questions that you need to answer when choosing a base or portable HF antenna:
- What are my physical constraints?
- Where your physical constraints might be due to your environmental space or a disability.
- Do I want a Broadband or a Resonant Antenna?
- Where Broadband antennas that offer touch free tuning on multiple bands are often less efficient and Resonant antennas that must be tuned from band to band are typically more efficient.
We are here for you!
Feel free to use the scrollable chart below or CONTACT US if you have any questions. We would be happy to help you select your next antenna system.
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