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As for the antenna, is there a way to modify the VHF section so it works better on channel 13? I believe 13 inch elements would be a half-wave dipole. The live elements on the antenna are 6, 26, 38, and 48 inches. That's not exact because its cold and dark out but close. It seems to me that with 13 being the lowest channel, I don't need any elements longer than 13 inches.
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You don't need to modify the antenna for channel 13. It's as good as it will ever be for 13. If you need more gain for channel 13, you should use an antenna with more gain.
Channel 13 is 210 to 216 MHz; center frequency 213 MHz. A half wave dipole is 5540/freq in MHz, with the answer in inches.
5540/213 = 26 inches for a half wave dipole
VU-75XR VHF/UHF/FM Antenna (150-2151)
Specifications Faxback Doc. # 38046
Average Gain
Low Band VHF 2-6: ...................... 2.8 dB
High Band VHF: 7-13..................... 5.8 dB
UHF Band: .................................... 5.6 dB
FM Band: 88-108 MHz................... -0.8 dB
Median Av. F/B Ratio
VHF Low Band: .................. 8.0
VHF High Band: ................. 9.0
UHF: ............................... 15.0
FM: ................................... 6.0
Average Half-Power Beam Width
Chan. 2 - 6: ................. 69 degrees
Chan. 7 - 13: ............... 49 degrees
UHF*: ......................... 54 degrees
FM: ............................. 72 degrees
* At Chan. 30 (566 MHz)
