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The "you tube" antenna, CECBs, and the DTV transition

post #1 of 10
Thread Starter 
I was impressed with reports of success using a homemade antenna made of inexpensive parts as described in this YouTube video. But I'm wondering if it will really be suitable for my purposes. I have two CECBs and I live in an apartment with no chance of using an outdoor antenna.

What concerns me before I go and spend the time gathering parts and putting the thing together is that I've read it will only work for UHF frequencies. Now it looks like most VHF channels are currently broadcasting their DTV signal in the UHF spectrum. But if my info is right, some will be using VHF after the DTV transition. E.g. in my area, according to this list, KGO (local ABC affiliate) will be broadcasting on RF 7 after the transition, KNTV (local NBC) will be on RF 12. It'd also be nice to get KVIE (PBS) over the air; not sure if that's likely but in any case it'll be on RF 9.

Any advice would be appreciated. Basically I'm wondering if I'll need a different design; it certainly seems that a UHF-only antenna whether homemade or commercial isn't going to do the trick for me.
post #2 of 10
Just add rabbit ears to your UHF antenna using a signal joiner and you should be good to go.
post #3 of 10
Quote:
Originally Posted by golinux View Post

Just add rabbit ears to your UHF antenna using a signal joiner and you should be good to go.

That depends on the range to and signal strength for the local stations. If he is 20 or 30 miles from the towers with no line of sight, rabbit ears probably won't do the job.

ewilen, if you want advice on suitable antennas, please post your zip code so we can see how far you are from the broadcast towers, the station current & future channels & ERP (power level), and whether they all are in the same direction or not. KNTV-DT NBC 11 is currently on VHF 12 and will stay there after the transition, so if you are in San Francisco area, you need to cover upper VHF and UHF this year.
post #4 of 10
I once hung a full-sized antenna from the ceiling of my apartment when I was in grad school. It worked great, and drove the landlord nuts!
post #5 of 10
Thread Starter 
Thanks for the replies and suggestions. afiggatt, my zip code is 94704. I currently have a rabbit ears/loop amplified antenna on one TV and it works fairly well but needs to be adjusted for different stations. I'm pretty sure I can get KNTV right now with it--I'd have to double check at home.
post #6 of 10
Distance and estimated signal strength matter. If you have a room facing the tower, and a window in that direction, that can help. In worst conditions, I found the best signal was unexpectedly in the middle of the room, so throw away your expectations re analog signals when you go hunting for digital signal.

I made the reflected coathanger version, better for multipath. For analog, the coathanger handles Channels 8+ with crystal clear image with my strong signal. I have a digital Ch 4 until February, so I built a dipole tuned to Ch 4, and it helps out with analog 2 and 6. But once I got my CECB, I found that with digital the coathanger antenna can tune real Ch 4 that's 15 miles away, and real channel 7 that's 30 miles away. It's just a little fussy about where it's aimed, but for digital I didn't have to use the dipole when the signal was relatively strong.

Apartment dwelling makes it a bit harder to try things for free. Ask an older relative if they have an extra balun, it used to be you got one with every electronic device you ever bought. For the wood, you might find a trashed wood pallet (I saw one just today), or constructions sites may let you have a piece of 2x4, or lumber yards may have free scrap piles.
post #7 of 10
Quote:
Originally Posted by afiggatt View Post

That depends on the range to and signal strength for the local stations. If he is 20 or 30 miles from the towers with no line of sight, rabbit ears probably won't do the job.

I'm 24-26 miles from the towers, heavily wooded and in a hollow to boot. Rabbit ears pick up analog VHF better than some of the analog UHF stations. The digital signal on all the UHF frequencies comes through fine without dropouts so far. In December, I'll be testing for a local station that's moving back to VHF7 to see how rabbit ears will do with the digital signal. After my experience with UHF, I'm hopeful there won't be a problem.
post #8 of 10
Quote:
Originally Posted by ewilen View Post

Basically I'm wondering if I'll need a different design; it certainly seems that a UHF-only antenna whether homemade or commercial isn't going to do the trick for me.

Hi there

The "you tube" antenna is a 4-bay without a reflector. There are other DIYers that are also concerned about receiving high-VHF as well as UHF. There is some success reported using a 2-bay with a reflector. Check the "how to build a UHF antenna" thread in the HDTV Technical forum; IIRC something like 10" long whiskers spaced 10" apart with a big reflector worked best.

Regards
post #9 of 10
Quote:
Originally Posted by blue_z View Post

Hi there

Check the "how to build a UHF antenna" thread in the HDTV Technical forum; IIRC something like 10" long whiskers spaced 10" apart with a big reflector worked best.

Regards

This is more or less what I've made, but without the reflector. I"m able to get our FOX affiliate on RF 9 pretty well, (I'm about 25 miles from the tower) but lose some signal at the higher UHF frequencies.
post #10 of 10
Thread Starter 
Quote:
Originally Posted by ewilen View Post

I'm pretty sure I can get KNTV right now with it--I'd have to double check at home.

Just double-checked. I do get KNTV. In fact it looks like I get everything from Sutro Tower and Mt. San Bruno. Others not sure as my SO is in the middle of watching a program so I don't want to fiddle with the antenna. BTW currently this particular setup is a Digital Stream DTX-9950 with an old RCA ANT130B UHF/VHF antenna...which contrary to what I wrote earlier is not amplified.
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