I tested 0% signal at 868mhz at about 24km, which was quite impressive as there was a building in the signal type, I couldn`t get anything here on 433mhz or any other place I tested at about 6km. Portable LPD radios are approved in most parts of Europe for royalty-free voice communication with analogue frequency modulation (FM) as part of the regulations for short-range equipment.  with a channel spacing of 25 kHz, for a total of 69 channels. In some countries, LPD devices can only be used with an integrated, non-removable antenna with a legal maximum output power of 10 mW. I don`t know why this is exactly the case, I can only assume interference Antennas used: 433mhz Have you ever figured out what`s going on with the 433mhz version? Which card did you use for 433 and what parameters? Harmonised European standards applied to equipment may give rise to the presumption that they comply with European directives, for example the Radio Equipment Directive. DRSs operate in shared frequencies on an unprotected and interference-free basis. If you believe that the interference is caused by unauthorised transmissions, you must report this to Ofcom. However, before contacting us, you should consult the documentation provided with the device or contact the manufacturer or supplier of the equipment for advice. For more information, see our work on radio wave protection and management. Ofcom, in collaboration with the RSGB`s Emerging Technologies Coordination Committee, has developed guidelines to mitigate the side effects of interference to some extent.   It really depends on your use case and what the 433 MHz bands look like in your area. 433 can be used by anyone commercially and non-commercially (including amateur radio for voice), while 868MHz is more or less reserved for LoRa/Digital applications.
If you`re out of luck, the 433MHz performs worse than 868 due to interference from other services/things. Regulations and controls are necessary for the operation of the radio. If you have not ensured that there are harmonic frequencies, elements can be transmitted, not only on the frequency you need, but also on various others. Not only would this reduce the likelihood that your transmission would be received by the intended receiver, but your signal could also be blocked by other transmissions in the environment or received by an unintended receiver. In Malaysia, this band is also in the 70-centimetre band (430,000 to 440,000 MHz) allocated to amateur radio. Holders of Class B amateur radio stations can transmit up to 50 watts of PEP power.  There is no licensing requirement for LPD as long as it meets the requirements of the Malaysian Communications and Multimedia Commission (MCMC). As provided for by mcMC in the Technical Code for Short Range Devices, remote control and security devices up to 50 mW ERP and up to 100 mW ERP for short-range communication (SRC) devices are permitted. RFID is allowed up to 100 mW EIRP. In the UK, LPD433 devices that meet the requirements of the ofcom interface can be used for model control, analog/digitized voice, and keyless remote access systems.  However, there is considerable leeway for interference, both on frequency and adjacent frequencies, as the band is anything but free. Frequencies from 430 to 440 MHz are allocated secondarily to licensed radio amateurs who are authorized to use up to 40 W (16 dBW) between 430 and 432 MHz and 400 W (26 dBW) between 432 and 440 MHz.
Channels 1 to 14 are UK amateur repeater outputs and channels 62 to 69 are UK amateur repeater inputs. This band is shared on a secondary basis for authorized and royalty-exempt users, the main one being the Ministry of Defense.  European keyless remote access systems often use the 433 MHz band, although, as in all of Europe, these frequencies are within the 70 centimetre band allocated to amateur radio and interference occurs. In Germany, before the end of 2008, radio enthusiasts could use frequencies from channel 03 to channel 67 for radio control of any type of model (air or terrestrial), all with odd channel numbers (03, 05, etc. up to Chapter 67), with each sanctioned frequency having a bandwidth separation of 50 kHz between each adjacent channel. Another thing to keep in mind: the transmission power can be very limited. At 433 MHz in Germany, you can only broadcast with an active power of 10 mW and 100% airtime, while at 868 MHz you can broadcast with 500 mW and 10% airtime (I think). Voice communication in the LPD band was introduced to reduce the load on the eight (now sixteen) PMR446 channels over shorter ranges (less than 1 km).  I am completely new to Meshtastic.
Which of the two T carriers should I buy for the UK/EU? He says that two frequencies are used in this region, but does not go into details on which is the best or which is most commonly used, etc. So how do I decide what to buy? Lora in the EU is mainly 868 MHz, so you should buy one of them.