HiZ Antennas (tm) Receiving Antenna Comparison Chart
A reasonable way to judge receiving antennas is by RDF factor.
RDF or Relative Directivity Factor seems to have been popularized by W8JI where the Gain in the forward direction is divided by the gain in all other directions.
This is not a new concept as it has been documented in the late 60's by paid government research and coined with the name "SNIF" or
more appropriately Signal to Noise Improvement Factor. Being that as it may we now use the popularized RDF which can be easily calculated by modern antenna
analysis programs. Even RDF can be fraught with problems as it assumes the unwanted noise will be coming from all directions.
Below are a series of 3D plots that begin to show how acutely different some of the modern antennas are in full pattern that carry
the same RDF value. For instance in early morning when the incoming reception angles are high the antennas with more reception at
high angles may work better than the lower angle antennas. And for long distance signals the antennas with the lower angle reception will dominate.
Also in combination with that the antennas with the higher angle back lobes may be more susceptible to noise than the antennas with low angle side lobes.
The plots and chart below point out that there is no one capture all receiving antenna, only ones that seem to shine
for DX and ones that shine for many purposes. Not all Beverage, loop, or vertical antennas will perform the same. A case in point is to look at the
350 foot BSEF 8 circle as compared to the HiZ 8A all active element 8 circle.
Below is a set of tabulated values for antenna comparison as well
Note: Measurements are at 20 deg elevation. 







Antenna 
Gain 
RDF 
Front/Back 
Beamwidth 



90 ft. top loaded TX vertical 
1.4 dBi 
4.9 
N/A Omnidirectional 
360 degrees 



K9AY loop 
25.6 dBi 
7.2 
11.5 dB. 
163 degrees 



4 square of K9AY loops 
22.2 dBi 
9.1 
18.9 dB. 
58 degrees 



10 Foot Dia. tuned loop 
2.2dBi 
4.0 
6.8dB F/Side Bidirectional 
105 degrees 



Flag 
29.7dBi 
7.4 
22.8dB 
146 degrees 



Beverage 1000 Ft. 
6.4dBi 
12.3 
31dB 
63 degrees 



Beverage pair 1000 ft. 400 ft. space 
2.9dBi 
14.6 
40 dB 
35 degrees 



Beverage 910 Ft. 
5.3dBi 
11.9 
15 dB 
64 degrees 



Beverage 500 Ft. 
10.6dBi 
9.0 
23.9 dB 
80 degrees 



Beverage 300 Ft. 
14.5dBi 
6.5 
9.9dB 
89 degrees 



4 square Tx antenna 
6.8dBi 
10.7 
25.5dB 
99 degrees 



Inverted vee 120 ft. 
1.08dBi 
.6 
N/A omni 
360 degrees 



Waller Flag 
54dBi 
12.2 
32dB 
84 degrees 











2 element HiZ Cardioid  50ft space 
amplified 
9.0 
35dB 
137 degrees 



Hi Z 8 element all active 200 ft circle 
amplified 
13.45 
44dB 
53 degrees 



HiZ Triangular Array 40 ft 
amplified 
9.21 
39db 
131 degrees 



HiZ 350 ft circle 4 active of 8 
amplified 
12.3 
20.8dB 
54 degrees 



HiZ Rectangular Array Bsef* Hiz vert array 70x320 
amplified 
12.9 
28.8dB 
51 degrees 



HiZ 4 square array 80ft 
amplified 
12.13 
41 db 
72 degrees 


















