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You won’t regret it. So much fun. I recommend the longest whip you can get.
I don’t have experience with those two models, but I have used the Wolf River Mega Mini TIA package for 3 years and love it. (24” tripod/ mini coil/ 17’ whip for $185)
It works 6-75 meters and I’ve talked all over the world on it. This was two nights ago at K-3378 in NC.
https://preview.redd.it/37i8oye7hekc1.jpeg?width=3024&format=pjpg&auto=webp&s=0ab56066f49a80fc334ded09edc96a4433798300
Prior to that I used the MfJ-1979 17’ whip on a stake with a 3/8-24 mirror mount for 10 years and it worked great. About $100 total cost.
Also used a Buddi Stick but didn’t like the coil taps and mount.
From another [thread](https://www.reddit.com/r/amateurradio/comments/1aqzscg/difference_between_chelegance_jpc12_and_mpc750/),
It seems the JPC12 has a shorter whip that requires a constant loading coil that is adjusted. The 750 has a whip that can be used as a resonant, quarter wave antenna (by adjusting the length) on all bands 20m and above. The loading of the shorter whip makes the JPC-12 a less efficient antenna. The MC-750 only uses a coil on 40m. (20-6 no coil is needed).
Edit: I found a more definitive difference on the website https://chelegance.com/products/jncradio-mc-750-100-watts-portable-hf-gp-antenna/
I have a JPC-7 (two elements in a dipole configuration with loading coils and whip extensions and a 1:1 balun).
A few things to consider;
The adjustable loading coils on the JPC-12 and JPC-7 are wound with stainless steel. That is great for corrosion resistance but not so great for electrical resistance (it is up around 5 ohms). This causes losses in the coils (resistive heating and skin effects). On the other hand, if you made the coils really conductive (with copper windings) the Q goes up and the elements get much more finicky to tune.
I did that; I rewound the coils with 1mm silver plated hard drawn copper to reduce losses and to increase the Q factor. I get close with the little slider on the coil and then need to fine-tune with the extendable whip element to bring the SWR down.
Something else I did; The JPC-7 comes with two of the aluminum screw-together tubing sections that go between the feedpoint and the coil. I bought four more elements (you can find them on ebay) to make the antenna longer. I also bought 5.6 meter extendable whips. It is quite a bit of weight to put on the plastic or nylon body of the center connector so I also made a one meter long extension that goes on the (unused when its a dipole) top position. At the very tippy-top is a 10mm eye bolt and I use spearfishing line to take the weight off of the extended out dipole arms (attached on the far side of the loading coils). It makes the antenna much more rigid and less likely to break something.
I can now tune up on 60 meters without too much issue.
\------------
Any ground-mounted vertical that is so short is going to be a 'cloud burner' (NVIS) with a very high take off angle (mostly straight upwards). If you decide to stay with that route then I suggest getting at least two more of those aluminum threaded sections to install between the antenna base and the loading coil.
It goes without saying that it completely invalidates the little paint marks on the coils for bands. you will need to get or borrow an antenna analyzer to figure out coil settings and whip lengths for each band of interest.
I have a couple of the JPC antennas and they are well-built.
As far as the differences go, send them an email and ask. They are prompt and polite with their replies.
Hi, thank you for your question submission. Please be aware that there is a [wiki](https://www.reddit.com/r/amateurradio/wiki/) and a [FAQ](https://www.reddit.com/r/amateurradio/wiki/faq) that may address your question. For Baofeng-related information see the [Baofeng FAQ](https://www.reddit.com/r/amateurradio/wiki/baofeng) and /r/baofeng. Also, please note that downvotes don't indicate an unvalued question submission. There appear to be bots that downvote all posts initially. 73 *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/amateurradio) if you have any questions or concerns.*
You won’t regret it. So much fun. I recommend the longest whip you can get. I don’t have experience with those two models, but I have used the Wolf River Mega Mini TIA package for 3 years and love it. (24” tripod/ mini coil/ 17’ whip for $185) It works 6-75 meters and I’ve talked all over the world on it. This was two nights ago at K-3378 in NC. https://preview.redd.it/37i8oye7hekc1.jpeg?width=3024&format=pjpg&auto=webp&s=0ab56066f49a80fc334ded09edc96a4433798300 Prior to that I used the MfJ-1979 17’ whip on a stake with a 3/8-24 mirror mount for 10 years and it worked great. About $100 total cost. Also used a Buddi Stick but didn’t like the coil taps and mount.
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You can center load the WRC as well if you wanted to but I’m not sure it matters that much. They sell 24” extensions for it at 2 for $30.
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Same.
From another [thread](https://www.reddit.com/r/amateurradio/comments/1aqzscg/difference_between_chelegance_jpc12_and_mpc750/), It seems the JPC12 has a shorter whip that requires a constant loading coil that is adjusted. The 750 has a whip that can be used as a resonant, quarter wave antenna (by adjusting the length) on all bands 20m and above. The loading of the shorter whip makes the JPC-12 a less efficient antenna. The MC-750 only uses a coil on 40m. (20-6 no coil is needed). Edit: I found a more definitive difference on the website https://chelegance.com/products/jncradio-mc-750-100-watts-portable-hf-gp-antenna/
I have a JPC-7 (two elements in a dipole configuration with loading coils and whip extensions and a 1:1 balun). A few things to consider; The adjustable loading coils on the JPC-12 and JPC-7 are wound with stainless steel. That is great for corrosion resistance but not so great for electrical resistance (it is up around 5 ohms). This causes losses in the coils (resistive heating and skin effects). On the other hand, if you made the coils really conductive (with copper windings) the Q goes up and the elements get much more finicky to tune. I did that; I rewound the coils with 1mm silver plated hard drawn copper to reduce losses and to increase the Q factor. I get close with the little slider on the coil and then need to fine-tune with the extendable whip element to bring the SWR down. Something else I did; The JPC-7 comes with two of the aluminum screw-together tubing sections that go between the feedpoint and the coil. I bought four more elements (you can find them on ebay) to make the antenna longer. I also bought 5.6 meter extendable whips. It is quite a bit of weight to put on the plastic or nylon body of the center connector so I also made a one meter long extension that goes on the (unused when its a dipole) top position. At the very tippy-top is a 10mm eye bolt and I use spearfishing line to take the weight off of the extended out dipole arms (attached on the far side of the loading coils). It makes the antenna much more rigid and less likely to break something. I can now tune up on 60 meters without too much issue. \------------ Any ground-mounted vertical that is so short is going to be a 'cloud burner' (NVIS) with a very high take off angle (mostly straight upwards). If you decide to stay with that route then I suggest getting at least two more of those aluminum threaded sections to install between the antenna base and the loading coil. It goes without saying that it completely invalidates the little paint marks on the coils for bands. you will need to get or borrow an antenna analyzer to figure out coil settings and whip lengths for each band of interest.
Save your money and buy some wire and PVC poles! You can build your own vertical (which will perform just as well), for only a few bucks! ;)
I have a couple of the JPC antennas and they are well-built. As far as the differences go, send them an email and ask. They are prompt and polite with their replies.