Outdoor antennas for cordless phones?
Answers: First, I must mention the cooperation that another answerer has posted referring to a site that sell "long range cordless phones" is selling equipment that are ILLEGAL to use, especially contained by developed countries that easily own the means to fine you $10,000 and/or throw you contained by jail for 6 months. They operate on 230-450 MHz, 135-137.5 MHz, 235-237.5 MHz which are allocated to civilian and MILITARY aircraft, ham radio, public sanctuary such as POLICE, amongst other things all of which your phone call would be interfering with.
As for the artistic question, tally an external antenna to a 900MHz phone is also illegal surrounded by the US. 47 CFR Section 15.243 (d) of the FCC rules state, "Any antenna
that may be used with the device shall be ineradicably attached thereto and shall not be readily modifiable
by the user." This applies to licence free 900MHz phones. Being that ham radio is the primary user of the frequencies allocated to 900MHz phones it is not much of a surprise. In addition, unlicenced 900MHz devices must adopt all interference from licenced users and must also stop operation if interference is experienced by licenced users of those frequencies, external antenna or not.
Furthermore, section 15.203 states, "An intentional radiator shall be designed to ensure that no antenna except that furnished by the responsible party shall be used beside the device." Unlicenced 2.4GHz and 5.8GHz devices are allowed directional fixed point to point antennas like used surrounded by wireless lan but a cordless handset is only just fixed. It looks like PCS rules apply to DECT handsets since it's surrounded by the same company and none of the special supplements for DECT cordless phones in subpart D mention anything give or take a few an antenna so we might see DECT phones with external antennas within the future; who know.
That being said... aside from the legalized implications it would be difficult to set up an external antenna on a 5.8GHz phone. Coax have a hard time carrying elevated frequencies. RG-6A (similar to your standard cable TV cable) has a loss of 14.6dB at a length of one and only 50 feet at 5.8GHz! What does that expect? If you were to transmit 100 watts into that cable, singular 3 watts would be supplied to the antenna at the other end. You'd lose 97% of the signal, receive and transmit. 2.4GHz? 8.35dB loss at 50 foot for over 85% loss of signal. 900MHz is 4.66dB for 66% loss at 50 feet. Using some super awesome cable (like LMR-600) you could attain that down to 25%. Fact of the matter is, unless you are looking for coverage surrounded by one direction, you're going to have a intricate time finding an antenna with adequate gain to overcome the loss garnered from a coax run. You'd be better past its sell-by date putting the base within a waterproof tupperware container over your roof or a mast and running the power and mobile phone cables backbone inside. You could charge your handset near extra charging cradles. Put the base on a UPS so that you don't own to reassociate the base and headset when the power goes out. Then, if you live contained by the middle of nowhere (meaning no one else around using impossible to tell apart frequencies and no electrical noise, intermod interference, etc), higher than a hill next to no trees or other obstructions you MIGHT carry your whopping 5 miles.
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