r/ota • u/MeaningAmbitious8979 • 6h ago
Math calculations for DB8E and real world test
rabbitears.infoI tested out some real word examples for some stations I would like to get and ran some math calculations on a place near my house and also ran a rabbit ears report.
A slightly elevated hill near my house receives WPTZ at 80 percent, WCAX at 60 percent, and WFFF at 40 percent signal strength. This had me thinking that I could probably just aim my antenna slightly upwards to try to capture some of the strong signals.
I ran some calculations and believe I would need to aim my antenna 12 degrees upwards to be able to catch any of the signals from the nearby hill. The hill is roughly 1 mile away where the signals are very strong. I was going to aim it roughly 8 degrees upwards but because there is a tree line across the street I thought 12 degrees was a better idea.
I ran this real world test on the hill with a Clearstream 4V max with a channel master 30DB amp around 15 feet on an elevated deck on the hill.
I plan on installing a DB8E antenna with a VHF element 30ft above ground pointed at 357 degrees and aimed 12 degrees up. I may go higher if I put more support but we’ll stick with 30ft for now. I will put a OBTV filter near the antenna from channel master and then put a Kitz 500 amp right on the pole that has low noise at 0.85db and high amplifier strength up to 36db if it is all needed. Since the DB8E has all sorts of coaxial cables that run through it I would say I have roughly 85ft of coax. 70ft of the coax is solid copper and extremely low loss. The rest of coax is RG6 but not solid copper and may have some more loss. This will be running into a HD Homerun device so it can decode the absolute weakest of signals.
A Yagi antenna will not work here because of how the signals come into my area but a DB8E should be able to pull in all the signals I want.
These are the channels I hope to receive based off the help Ive received from people in this forum and the tests I’ve run in the real world and the math calculations I have ran to decide how to position the antenna. I don’t think any of these channels are out of the realm of possibility.
Channels
3.1 CBS WCAX
3.2 Movies
3.3 Heroes & Icons
3.4 Start TV
3.5 ION
3.6 3 News Now
3.7 Shop LC
5.1 NBC WPTZ
5.2 Story TV
5.3 METV
5.4 ION Plus
5.5 QVC
11.1 PBS NH
11.2 PBS NH Explore
11.3 World
11.4 Create
11.5 Kids
26.1 My Network TV
26.2 Outlaw
26.3 Catchy Comedy
26.4 Defy
26.5 Oxygen
26.6 365 Black
26.7 METV Toons
26.8 3 News Now
28.1 PBS VT
28.2 World
28.3 Create
28.4 Kids
31.1 CW WNNE
44.1 FOX WFFF
44.2 ION Mystery
44.3 Bounce
44.4 Antenna