Recently I have been getting slow wireless speeds, I have been told its due to my old wireless router (vmdg480) is there anyway to get this upgraded so I can have 5ghz and 2.4ghz at the same time. I have been told 5ghz increases my wireless speeds.
You can get better speeds on the 5Ghz band as it is wider and you can use channel bonding with less fear of interference than the narrow 2.4Ghz band.
I would give Retentions (Thinking of leaving us option) a ring and have a friendly chat to see what your options are to upgrade to a SH2AC or Hub 3. Both hubs will be able to broadcast on the 2.4 and 5Ghz bands simultaneously.
Wireless speeds will depend heavily on what wireless clients you use, to get the best speeds you will need to use multi stream (MIMO) wireless clients, preferably on the 5Ghz band (where you can use channnel bonding), or wireless AC clients in conjunction with the SH2AC or Hub 3