Shively Labs FM Antennas and Accessories
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Typical Data for
Model 6510 FM Antenna (half-wave-spaced)

  • Vertical Polarization
  • 10 kW Power Rating per Bay
  • Radomes & Deicers Not Required
  • Shively Standard Features:
    • Low Weight and Windload
    • Adjustable Transformer Standard Equipment
    • Rugged Corrosion-Resistant Mounts
    • Easy to Install - Minimum Maintenance
    • Pressure Relief Valve for Easy Purging
    • Pattern Studies and Directional Patterns Available

Performance Specifications:

Polarization:
Vertical only.
VSWR:
1.04 : 1 or better, ± 100 KHz.
1.06 : 1 ± 200 kHz
Input Connection:
Female 3-1/8" EIA.
Feedline:
3-1/8" rigid

Electrical Specifications (half-wave-spaced):
No. of
Bays		 Gain
 Power
Rating
kW		 No. of
Bays		 Gain
 Power
Rating
kW
Power dB Power dB
2
1.40
1.46
20
8
5.06
7.03
40
3
2.02
4.05
30
10
6.28
7.96
40
4
2.62
4.17
40
12
7.50
8.74
40
5
3.24
5.08
40
14
8.72
9.39
40
6
3.84
5.83
40
16
9.92
9.96
40

Notes:

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

Gain is provided for vertical 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 (half-wave-spaced):
No. of Bays Vertical Tower Space
 Weight
Antenna radiation aperture
 Physical
space used
 Total tower space recommended
 without
ice
 with 1/2"
radial ice
ft m ft m ft m lb N lb N
2
5
1.6
14
4.6
25
8.2
115
513
326
1454
3
10
3.3
19
7.2
30
9.8
173
772
513
2288
4
15
4.9
24
7.9
35
11.5
231
1030
700
3122
5
20
6.6
29
9.5
40
13.1
289
1289
886
3952
6
25
8.2
34
11.2
45
14.8
347
1548
1073
4786
7
30
9.8
39
12.8
50
16.4
406
1811
1260
5620
8
35
11.5
38
12.5
55
18.0
458
2043
1423
6347
10
45
14.8
48
15.7
65
21.3
535
2386
1771
7899
12
55
18.0
58
19.0
75
24.6
652
2908
2145
9567
14
65
21.3
68
22.3
85
27.9
768
3425
2518
11230
16
75
24.6
78
25.6
95
31.2
884
3943
2892
12898

Windload (half-wave-spaced):
No. of
Bays		 Revision "C"
 Revision "F"
without ice
 with 1/2" radial ice
 without ice
 with 1/2" radial ice
lb N lb N ft² m² ft² m²
2
265
1182
376
1677
8.9
0.83
11.8
1.10
3
416
1855
588
2622
14.0
1.30
18.6
1.73
4
566
2524
801
3572
19.0
1.77
25.4
2.36
5
717
3198
1013
4518
24.2
2.25
32.2
2.99
6
868
3871
1225
5464
29.3
2.72
39.0
3.62
7
1018
4540
1437
6409
34.4
3.20
45.8
4.25
8
1151
5133
1625
7248
38.8
3.60
51.7
4.80
10
1409
6284
1992
8884
47.9
4.45
63.9
5.94
12
1710
7627
2416
10775
58.1
5.40
77.5
7.20
14
2011
8969
2840
12666
68.3
6.35
91.1
8.46
16
2312
10312
3264
14557
78.5
7.29
104.7
9.73

Notes:

  1. The mounting structure must not flex more than ± 1/2 in (± 1.2 cm) in any 10-ft (3-meter) section. Five 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: 02/26/2007
Webmaster: Al Friend
© Copyright 2007 Howell Laboratories, Inc.