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Not good to have metal guy wires going right up underneath the antennas. That can skew the antenna pattern upwards and loose gain at the horizon where you need it. You should be able to attach guy wires just above the lowest part of the top section which would be about 8ft below the top of the...

Wow, looks like a big out of band signal is swamping the front end of the receiver either saturating the front end amp or causing massive AGC.

I might add that the 200MHz range is common for power distribution companies to receive with directional antennas when sniffing for power line zap and its very effective. Several years ago I got hired to find interference to a C-band satellite downlink at a satellite uplink site in Marina Del...

A good way to diagnose your problem is with a spectrum analyzer and a cheap SDR with spectral display may work. You can usually see powerline zap noise as dancing spikes on a spectrum analyzer around your channels of interest which can confirm the problem or point you in another direction. Power...

I do a lot of portable antenna stuff with ham radio and have a fold over trailer hitch mount and military surplus masts that will go up about 24ft and hold up a moderate size antenna. All of this is available off Ebay. I also used commercial PA speaker tripods which will get an antenna to about...

If your going to roof mount a TV antenna be aware the proximity of the roof to the antenna can push the antenna pattern upwards and seriously degrade performance at the horizon. This is because when you are lower than a few wavelengths above ground or a large reflective surface like a car roof...

A little confusing on how the OP has things all wired up but I can say an AGC amplifier can be troublesome. They work great on a test bench but hooked to an antenna, signals from the police car down the street or fire truck up the street or the ham operator two doors down will cause the gain of...

I literally have a garage full of preamps here with a few costing over $1k and do a lot of testing but mostly for wide band VHF/UHF radio work. I generally use a spectrum analyzer to see before and after the preamp checking for IMD and other artifacts. The KT-200 has an FM trap and that will go...

The noise figure of the KT-200 is very good, the gain is a bit high and they don't publish some of the most important specs like IP1 (1dB compression) and IP3. Those determine how the amplifier will play in a high RF environment and if it will produce IMD. Looking at its current consumption of...

Looks like one carrier is about 30dB C/N, one is about 25dB and the worst is maybe 20dB, huge signals overall.

If you don't have any VHF low band channels this is about the best passive antenna I have found for the price and they work very well. If you don't have to feed a mile of coax these will work better than the little amplified jobs and you can get two for $26 plus shipping. Buy One Get One Free...

I have not measured the newer LTE specific filters but similar cheap made in China filters can often have 2dB or more insertion loss within the pass band and the attenuation near the 700MHz cutoff frequency may only be a few dB with little effect on interfering signals in the low 700Mhz range...

I just finished helping install and test a new VHF TV transmitter in So Cal to replace a UHF for a station doing the repack thing. It should go to air today and they need to vacate their UHF frequency very soon for another station to take over. Its the same programming, same ATSC format as the...