After several failed attempts to buy simple rabbit ears for FM tuner I decided to make my own. Now, I have zero knowledge in RF circuits. While finding the formulas for pole length wasn't hard, I could not find much on toroid chokes. Or rather, I found too much of it.
So, I decided to look at manufacturer's datasheets (e.g. here) and found this: "43 Material is used for EMI/RFI suppression in the 20 MHz to 250 MHz range". Hurray! In another place: "Common ferrite types used for HF baluns are 43, 31 and 61". So I go to digikey and none of those materials there, even though there are thousands of toroids and dozens of core materials.
Question: What common ferrite materials are suitable for a choke with 3-4 turns of micro coax, for 88~108 MHz range?
From the document reference kindly provided by @jonk it seems ferrite cores #31, #43 and #61 are indeed good fits for this application. Here are some examples from different (not Amidon) manufacturer:
FT82-43 RFI Suppression 5 - 500 MHz, 21.0 x 13.2 x 6.35 mm
FT82-61 RFI Suppression 20 - 500 MHz, 21.0 x 13.2 x 6.35 mm
I removed images irrelevant to the question.
Also, there seems to be a confusion about my goal. Here is an explanation of what I am trying to do: from many different sources like this one it is recommended to have RF choke (also called feedline choke) added to coax cable to suppress signal pickup by coax braid. Since I am making antenna from scratch anyway, why not make it right, right?