Hello and welcome!
When it comes to indoor antennas, you won't find anything for VHF that does any better than rabbit ears. That's because the long wavelengths of VHF frequencies requires long antenna elements and wide element spacing to work effectively. Rabbit ears are a simple 2 element dipole, and that's about as good as it gets for two VHF elements. To get anything with 4 elements or more, you're talking about something that's too big for "set-top" sized antennas.
If you want more gain, you'll need to go with something bigger, and that means antennas that are more suitable for attic or rooftop installation.
Before we get into bigger antennas, maybe you should check to make sure you're making the most out of your rabbit ears. Rabbit ears will have their maximum gain when the two elements are laid out horizontally, directly opposite each other and equal in length (almost an idea dipole). The fully horizontal position will have a little bit more gain than a "V" configuration. The elements should be kept away from other conductive objects as much as possible.
To optimize gain in the upper VHF frequencies (since you need channels 7 and 9), you'll want to extend the elements until they are about 40-45 inches tip-to-tip in their horizontal position. If you extend the elements longer than that, you'll actually be tuning the antenna to even lower frequencies (i.e., lower VHF).
Your strongest channels are very strong, and that makes me worried about amp overload. If possible, make sure you're not using any amplification in your setup. An overloaded amp can make things worse rather than better.
If none of this is helping you enough and you're ready to consider an attic or rooftop antenna, then I'd recommend going with An Antennacraft HBU-33 or Winegard HD7694P. Don't use any amplification. These antennas are very likely going to get you down into the 30 dB NM or better.
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