One of these, rf only. https://www.amazon.com/Fancasee-Adapter-Coupler-Converter-Connector/dp/B07R3B2Q38

• Yes that is a CRT
• HDMI to 3.5mm antenna is a non-existant connection and I will explain why and what you need to do.
• You will not like the look of any HDMI signal onto that tiny and cheap CRT (I own this TV and know)

Okay so any signal over HDMI is a digital signal, CRTs operate using only an analog signal (for the most part, there are some later digital sets). You would need to put your HDMI signal into a converter like this one. This transforms the signal into RCA/Composite. Then you take that signal and run it into one of these and then on the side that says To TV you put a coaxial cable from there to one of these. Then you take that and plug it into the 3.5mm antenna plug on the side of the TV.

I have a similar set. I bought this 3.5mm to COAX adapter on Amazon for like $8

[F Type Female to 1/8" 3.5mm Male Mono Plug Jack Adapter Coupler Converter

](https://www.amazon.com/dp/B07R3B2Q38/ref=cm_sw_r_apan_glt_i_3X4NXKSWD8ECVBPXP34Y?_encoding=UTF8&psc=1)

I then plugged that into a RadioShack RF modulator I had lying around that took the coax and adapted it to S-Video