Instruction: Generate an answer to the question by utilizing the information contained in the document.

Input:
Question: where do you plug-in the external antenna ?
Document: Reception is limited with the built in antennas. I am sure it would be better with an external (outdoor) antenna.
the Kaito radio operates as it was described utilizing solar, crank, battery, 120 volt power. Good reception with out external antenna.
There is a reason they sell an external antenna for this radio--you need it. I live in the heart of San Antonio, Texas and the strongest radio stations come in weak and with static. This radio would be a nice little radio if it included an external antenna and was priced more in the $25 range. . I have had good luck with the solar panel to run the radio...only in bright full sun--  but the charge last only about ten minutes.
I like to listen to music and news while sitting at the telescope, and the SW bands are nice for listening to WWV time signals to get UTC time when logging reports. Yes, the telescoping antenna is flimsy and seems like it'll break anytime, but to remedy this, I purchased a portable external clip-on antenna from Sangean to attach to the antenna when lowered to it's lowest point. I just hang the external antenna in a nearby tree (or just string it to the telescope).
I got this for my dad who always used the wall plug in and battery opperated weather radios! He liked it enough he got another one for the farm to leave there!
Got this item quickly and it is a great quality product. Just doesn't have the right plug to charge my phone, but I'm sure they listed them and I just thought one of them would fit. +++++++++++++++++++++++++++++++++
And if you need it in case of power failure there are many backup options. Hand crank, battery, and for extra you can purchase a plug in. I bought one for each of the children's families.
does this product have a audio in jack? Has all the features im lookign for - but can i play and charge my mp3 player off of it? can you plug in a flash drive in the usb port and listen to audio that is on the flash drive?
Wow, this little radio has it all. It can run on batteries, crank or solor. The radio is very clear and we live upstairs in an apartment building. It cranks easy. You can even get the adapter if desired and plug it in to electricity.
OK product - I purchased it to have a way to charge my cell phone in a power outage...it reads as though you can just plug it in, and as long as it's on battery it will charge...that is not the case. From what I can see, the only way to charge is to hand crank when it's plugged in. I tried cranking it for 2 minutes, the battery % didn't move.
Answer: Using the Kaito Radio antenna, it just clips to the telescoping antenna on the radio (no plug) and extends from the reel to it full length.