Is the room that your scanner is in the size of a gymnasium? There are several world-class antennas available but they are big...What the best indoor antenna
What the best indoor antenna


What the best indoor antenna
The one situated by a window facing the direction of the target RX site & with mininal sources of electrical RFI around it. As others have pointed out we will need some info on what agency(ies) you're trying to bring in betterWhat the best indoor antenna
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I had one of those a few years back and they were awesome antenna's (The Sputnik)So since you're in the scanner/ receiver antenna forum we have to assume that you're looking for an antenna that will pick up a wide range of frequencies. You really give no specifics.
You can simply get a good mobile antenna with the magnet mount like the Larson tri-band and attach it to a pie plate or cookie pan or file cabinet for grounding or you can purchase a mini- discone or ground plane and attach it to a floor lamp, hat rack or tripod. Use low loss coax and set it up near a window. You can rotate it and move it around for better reception.
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Yes I bought my first one in the '60s from Radio Shack for $5.95, that was pricey then, it didn't have the two 4-in prongs at that time, they were added later. I always use this antenna from Radio Shack.I had one of those a few years back and they were awesome antenna's (The Sputnik)
What the best indoor antenna
OP has not replied since his original Post on August 2nd but does refer to a trx2 and an HP 2 in other threads. Shrugs.For what band/frequencies?