With a 1:1 balun, 75 ohm coax is a better match than 50 ohm for a 73 ohm dipole. Of course, chances are the only place in the universe your dipole is actually 73 ohms is in a NEC simulation.
For receiving only, matching is not super critical. I personally use 75 ohm RG-6 coax because it is cheap and easily found. I usually leave the F connectors on and use adapters as necessary.
I don't mean to step on toes and be a ass especially because I'm "new" to your guys world but here's the thing your radio what ever it may be is expecting a 50ohm impedance by using a 75ohm coax (TV coax) you now have a loss then add your dipole which is yes in a perfect world 73ohm again there are more factors for me to list that would impact impedance of a dipole
The purpose of a balun or balance unbalance transformer is to match the impedance of your antenna to te nominal impedance of the coax going to your radio not the coax to the radio
Yes 75 ohm coax is a better match for the dipole and in that very instance a balun would not be nessicarily at all ! Other then to seperate the sheild from the antenna in which case you could use a ugly balun however the goal and objective is to Match the impedence of the radio
Again kinda superficial because you won't be transmitting
With that said things to take into consideration when using TV coax firstly it is not even close to 100% shielding like no where near 2 it has a high db loss over larger runs 3 if you use regular F connector you might as well just through a attenuator on the line then on top of the adding adapters even more attenuation
IM by no means saying it won't work im simply saying that if you want your best quality signal and you want a dipole that's ideal with low loss your best solution is to cut each legs to resonance add insulators on both ends of the less put a 1:1 balun in the center of that feed it with preferably N connectors however regular pl259 -so239 will work just fine use a good quality low loss coax with a 50ohm impedance to your radio on runs less then 35-40 feet I would just use regular rg-58u coax and then seal the outside end with butyl tape to prevent water ingress additional to cut back on some noise you can make a air wound choke with coax or use clip on ferrite beads to keep crap off the shield of the coax from near by Ed noise sources
My 2 worthless Canadian cents
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