Instruction: Answer the given question using the supporting document.

Input:
Question: Can the antenna be upgraded on either unit? If so, is it a standard BNC connector?
Document: The only annoyance was that turning the receiver's volume up high would result in feedback noise when triggered. Then it stopped triggering either receiver. The company sent me another transmitter. This one would only trigger one receiver, and the reception on that one was very scratchy. We tried changing locations slightly for all three units. We tried different antenna lengths. We tried different channels. We bought and tried another new set of batteries.
Do NOT be deceived about flaws in desgin. there ARE ways to avoid water damage of this detector and means to protect the antenna of the detection unit.
WHAT IS IN THE BOXInfrared sensorAlert system baseWHAT IS NEEDED6 AA BatteriesINSTALLATIONThe default for the system is set for outdoors with the infrared light on and maximum detection distance. I don't want anyone to be alerted by the light so I disabled it. The settings use small jumpers to toggle the settings on and off. I simply nailed the unit to the tree, after installing the batteries and screwing in the antenna.
I have owned the Dakota MURS system for 2 years now and decided to add another base station as well as remote. The "New Remote Unit" I received today has been updated to utilize a new style antenna as well as the outer case color is now black. The new antenna is a stubby rubber duck antenna which replaces the telescoping whip (as seen in the Stock Product photo).
Did not like the addition of the external antenna - makes it too easy to see from the road and succeptable to damage/weather - and did not like the 9v battery being replaced with 6 smaller batteries. Also, any cars moving past may be out of sight before the unit alarms react. The ring tone has been replaced with a voice..."Alert. Zone 1" sounds three times. This is irritating and there is no adjustment to limit the number of times it reports.
Initially tried a more expensive unit that worked (supposed to anyway) with a magnetic sensor buried next to driveway. Useless. This is simple and effective. I'd rather get an occasional false alarm than none at all, and it's normally caused by animals or unusually high winds affecting nearby trees. Receiver is about 120-150' from transmitter. Antenna could me of the more modern "rubberized" type instead of 30+ year old solid, extending type technology.
The cover is only three sided - remains open in the back and bottom. Now I am stuck with a three sided bird house cover that I can't even use as an actual bird house as it is missing a back, bottom and has a hole in the top where the antenna poked out. :(  I think a cover is needed to conceal the unit from prying eyes, but one could probably make something better themselves instead of spending $15 on 4 pieces of thin wood.
Either way, your best results will usually come if you mount the transmitter 3 to 4 feet off the ground and about 20 feet from the trail or drive. You might experiment with moving the transmitter up or down slightly to find the best location.Please let me know what happens when you try the different locations.Thanks,Jason QuamDakota Alert
I did a lot of research on all the available products in this price range and this one is by far the best. Simple research will show that. We couldn't fine the product locally, so we eventually selected this seller because of the Amazon backing and price. Our home is 650+' from the road at the end of a straight driveway. The driveway cuts through a 75' wide treeline opening up to 2 fields on either side of the driveway, then the main road.Installation was very simple.
I installed item as specified, less than 600 feet up my driveway. The base station was in direct line of site of the transmitter, however, the alarm did not pick up people or vehicles more than 20 - 25 feet away...and then only part of the time. Good news is that I never had any false alarms, but did not get valid alarms either. Spoke with Dakota technician on the phone about how to fix. Incidentally, Dakota had excellent customer service!
Answer: As for the receiver-Yes, it is a standard BNC connection.  I have several of the transmitters and the older legacy units came with the standard BNC connection whip antennas however, the newer models now have a SMA antenna connection.