here is a guide for signal loss due to the length of coax tv cable you install
as you can see there is a
signal number
Long Length 100 meters
Short Length 100 feet
Although most of us will want to stay below 100 feet from our antenna to our tvs it is important to look at this guide for a different reason.
If you are setting up an Antenna and you are selecting between ones with different rated gain this guide can be helpful.
100 feet is the constant here
the difference is the signal frequency.
As you can see lower frequencies have less loss
Higher frequencies react harsher to the same signal loss
THE LOSS HERE IS THE LENGTH OF CABLE
it can also be related to choosing an antenna which is rated at say
5db .. 10db or 15db or better with an amp
The higher stations will perform worse under the same conditions.
for your consideration
VHF is 54 to 216
FM and other signals live between VHF and UHF
UHF is 470 to 800
at 100feet of cable
channel 2 will lose 1.60db of available signal from the antenna
and channel 69 will lose about 6db
I hope this might give reference to those doing research.
Code:
Electrical Performance
Frequency Attenuation (dB/100 m) Attenuation (dB/100 ft)
5 MHz 1.90 0.58
55 MHz 5.25 1.60
83 MHz 6.40 1.95
187 MHz 9.35 2.85
211 MHz 10.00 3.05
250 MHz 10.82 3.30
300 MHz 11.64 3.55
350 MHz 12.63 3.85
400 MHz 13.61 4.15
450 MHz 14.43 4.40
500 MHz 15.29 4.66
550 MHz 16.08 4.90
600 MHz 16.73 5.10
750 MHz 18.54 5.65
865 MHz 20.01 6.10
1000 MHz 21.49 6.55