Welcome @Steve Margenau, so glad you found us - and are now afflicted with OCCD (Obsessive Carver Collecting Disorder) ..., it creeps up on you slowly...
The TX-11 is a great tuner, and I'm thrilled to see another FM-fan join. There's a few of us left. Carver's advances with ACCD and tuner's for stereo broadcast were legendary for the hey day of FM. And, today, still perform superbly.
I have the baby brother, the TX-2 in my office. And the big sister of yours, the AM/FM version, the TX-11a, and a black-faced TX-11b in my main listening set-ups. The 11a and 11b have some additional circuitry - so imagine "better" than what you are experiencing now! 😉
One of the pivotal things I did to advance/improve my FM was to put an external FM antenna in my attic, connect it to the Whole-House coax, with an old Radio Shack FM antenna amplifier - OMG, the stations that pulls in.
Here's what the Radio Shack FM amplifier looks like (they come in silver and black) - often found on eBay for $25..., well worth the investment. the one below is listed on eBay for under $14. Another, NEW IN BOX, black one is selling for $25, at this link: Radio Shack 15-1113C High-Gain UHF VHF FM Signal Amplifier | eBay
(read more below the image, on antennas)
One of our members, @kve777 of the Carver Site did a thread on building a "Copper Cactus" radio antenna. Doing a google search on "Copper Cactus Antenna" pulls up many references and DIY How-To threads. The one by our member is pretty damn good. I had a dipole, which did great - but then I "cut the cable/cord" and went to OTA Digital TV, and picked up a Channel Master Digital TV antenna, hung it in my attic, ..., online research let me know that it also pulls in FM/AM..., so I hooked up my TX-xxn tuners - to really advance things. In retirement, I think I'll build a copper cactus..., and do an A-B comparison..., but haven't got to that project yet.