Shively Labs FM Antennas and Accessories
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Typical Data for
Model 6600 FM Antenna (full-wave-spaced)

  • Horizontal Polarization
  • Power Rating: 5 kW per Bay
  • Shively Standard Features:
    • Ring Stub Design
    • Low Weight and Windload
    • Consistently Predictable Patterns
    • Digital-Ready
    • Pattern Studies Available
    • No Factory Personnel Needed to Install
    • Adjustable Fine-Matching Transformer
    • Radomes and Deicers Available
    • Rugged Corrosion-Resistant Mounts
    • Works with Regular Towers; No Need for Special Frequency-Sensitive Tower Sections
    • Pressure Relief Valve for Easy Purging of the System
    • Special Spacing, Null Fill and Beam Tilt Available

Performance Specifications:

Polarization:
Horizontal only.
VSWR:
1.08 : 1 ± 100 kHz.
1.16 : 1 ± 200 kHz
Azimuth Pattern Circularity:
± 1.5 dB on pole.
Input Connection:
Female 3-1/8" EIA.

Electrical Specifications (full-wave-spaced):
No. of
Bays		 Gain
 Power
Rating
kW		 No. of
Bays		 Gain
 Power
Rating
kW
Power dB Power dB
1
0.92
-0.36
5
7
7.74
8.89
35
2
1.98
2.97
10
8
8.92
9.50
40
3
3.10
4.91
15
10
11.3
10.53
40
4
4.24
6.27
20
12
13.7
11.37
40
5
5.40
7.32
25
14
16.1
12.07
40
6
6.56
8.17
30
16
18.5
12.67
40

Notes:

Our gain figures are derived from the computed directivity and include the losses in the antenna feed system.

Gain is provided for horizontal polarization only. Gain will be reduced if null fill, beam tilt, or special wavelength spacing is provided. Gain will increase in a directional array by the directivity of the azimuth pattern.

Size and Weight (full-wave-spaced):
No. of Bays Vertical Tower Space
 Weight
Antenna radiation aperture
 Physical
space used
 Total tower space recommended
 without
radomes
 with
radomes
 with radomes &
1/2"radial ice
ft m ft m ft m lb N lb N lb N
1
2
0.7
9
3.0
60
6.6
71
268
93
415
177
789
2
10
3.3
19
6.2
30
9.8
101
450
167
745
343
1530
3
20
6.6
29
9.5
40
13.1
141
629
240
1070
509
2270
4
30
9.8
39
12.8
50
16.4
182
812
314
1400
675
3011
5
40
13.1
49
16.1
60
19.7
222
990
387
1726
841
3751
6
50
16.4
59
19.4
70
23.0
263
1173
461
2056
1007
4491
7
60
19.7
69
22.6
80
26.2
303
1351
534
2382
1173
5232
8
70
23.0
73
23.9
90
29.5
322
1436
586
2614
1296
5780
10
90
29.5
93
30.5
110
36.1
403
1797
733
3269
1628
7261
12
110
36.1
113
37.1
130
42.6
484
2159
880
3925
1960
8742
14
130
42.6
133
43.6
150
49.2
565
2520
1027
4580
2292
10222
16
150
49.2
153
50.2
170
55.8
647
2886
1175
5241
2625
11708

Windload (full-wave-spaced):
No. of
Bays		 Revision "C"
 Revision "F"
without radomes
 with radomes
 with radomes & 1/2" radial ice
 without radomes
 with radomes
 with radomes & 1/2" radial ice
lb N lb N lb N ft² m² ft² m² ft² m²
1
70
312
149
665
188
838
2.2
0.2
4.2
0.4
5.1
0.5
2
140
624
297
1325
373
1664
4.6
0.4
8.6
0.8
10.8
1.0
3
210
937
445
1985
558
2489
7.0
0.7
13.0
1.2
16.5
1.5
4
280
1249
593
2645
743
3314
9.5
0.9
17.4
1.6
22.1
2.1
5
350
1561
741
3305
928
4139
11.9
1.1
21.8
2.0
27.8
2.6
6
420
1873
889
3965
1113
4964
14.3
1.3
26.2
2.4
33.4
3.1
7
490
2185
1037
4625
1298
5789
16.8
1.6
30.6
2.8
29.1
2.7
8
533
2377
1159
5169
1437
6409
18.3
1.7
34.1
3.2
43.2
4.0
10
673
3002
1455
6489
1807
8059
23.1
2.1
43.0
4.0
54.5
5.1
12
812
3622
1751
7809
2177
9709
28.0
2.6
51.8
4.8
65.8
6.1
14
952
4246
2047
9130
2548
11364
32.9
3.1
60.6
5.6
77.1
7.2
16
1092
4870
2343
10450
2918
13014
37.7
3.5
69.5
6.5
88.5
8.2

Notes:

  1. The mounting structure must not flex more than ± 1/2 in (± 1.2 cm) in any 10-ft (3-meter) section. 5 feet (1.5 m) of mounting structure is required above and below the antenna bays for proper pattern formation.
  2. Antenna radiation aperture is the distance from the center of the top bay to the center of the bottom bay. Physical space used is from the top of the top bay to the input flange at the bottom of the array, or the bottom of the bottom bay in a center-fed array. Total tower space recommended allows ten feet (3 m) of clear tower space above and below the antenna to protect from pattern interference by other antennas. At frequencies lower than 98 MHz, each of these dimensions will increase by up to 1 ft (0.3 m) per bay.
  3. Seven bays or less are normally end-fed. All antennas supplied with beam tilt will be center-fed. Antennas with an odd number of bays are normally not available with center feed.
  4. Windload and weight tabulations are estimates and assume 98 MHz. They include the bay, interbay feedline, input connection, and a fine-matching transformer. No values have been included in these tabulations for mounts. Actual values vary with the specific installation. Contact us with details of your installation if more precise values are needed.
  5. Antenna windloads are calculated for 112 mph (180 kph), using 50 psf (2400 N/m²) for flats and 33 psf (1600 N/m²) for rounds] per EIA standard RS-222-C and CSA standard S37-94. The surface area is calculated per EIA standard RS-222-F (CaAc).
  6. Ask for technical assistance at Shively if you are planning to mount antennas on AM towers or install them at altitudes over 3,000 ft (915 m) above mean sea level.
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Last updated: 11/30/2007
Webmaster: Al Friend
© Copyright 2007 Howell Laboratories, Inc.